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PHP Cheat Sheet

Posted in PHP

Variable Handling Functions  

Variables in PHP are containers for storing data. 

  • A variable name is preceded with a $ sign. 
  • It must start with a variable or an underscore.
  • A variable cannot be started with a number.
  • A variable can only contain alphanumeric characters.
  • Variables are case-sensitive. $Result and $result are treated as two different variables.

Variable Functions allow us to define, use and manipulate variables as required.

1. 

boolval

Returns the boolean value of a variable.

2. 

debug_zval_dump

Dumps the string representation of an internal zend value to output.

3.

doubleval

Alias of floatval.

4.

empty

Determines whether a variable is empty.

5.

floatval

Returns the Float Value of a variable.

6.

get_defined_vars

Returns an Array of all defined variable.

7.

get_resource_type

Returns the resource type.

8.

gettype

Returns the type of a variable.

9.

import_request_variables

Imports GET/POST/Cookie variables into the resource type.

10.

intval

Get the integer value of the variable.

11.

is_array

Determines whether the variable is an array

12.

is_bool

Determines whether a variable is Boolean

13.

is_callable

Verifies if the contents of a variable can be called a function.

14.

is_float | is double | is_real

Determines whether the type of a variable is ‘float’.

15.

is_int| is_integer | is_long

Determines whether the type of variable is an integer.

16.

is_null

Determines whether a variable is NULL

17.

is_numeric

Determines whether a variable is a number or a numeric string.

18.

is_object

Determines whether a variable is an object.

19.

is_resource

Determines whether a variable is a resource.

20.

is_scalar

Determines whether a variable is scalar.

21.

is_string

Determines whether the type of variable is string.

22.

isset

Determines if a variable is set and not NULL.

23.

print_r

Prints information in human readable format.

24.

serialize

Generates a storable representation of a value.

25.

settype

Set the type of a variable.

26.

strval

Get the string value of a variable.

27.

unserialize

Creates a PHP value of a stored variable.

28.

Unset

Unsets a given variable

29.

var_dump

Dumps information about a variable.

30.

var_export

Outputs or returns a parsable string representation of a variable.

Array Functions

An array is used to store a list of values in one single variable. The values can be accessed by referring to an index number which always starts with 0. Arrays can be:

  • Indexed: Default Array Format. Values can be accessed by index number.
  • Associative: Use named keys.
  • Multidimensional: Can also be referred as a matrix. It contains one or more arrays. You can also think of it as a nested array.

Array Functions allow us to define, store, traverse data and information as required.

1.

array()

Declares and creates an Array.

2.

array_change_key_case()

Returns an array with all keys in lowercase or uppercase. 

3.

array_chunk()

Splits an array into chunks of Array.

4.

array_combine()

Creates an array by using one array for keys and one for values.

5.

array_count_values()

Returns an array with the number of occurrences for each value.

6.

array_diff()

Compares array values and returns the differences.

7.

array_diff_assoc()

Compares array key and values and returns the differences.

8.

array_diff_key()

Compares array keys and returns the differences.

9.

array_diff_uassoc()

Compares array keys and values, with an additional user made function check, and returns the differences.

10.

array_diff_ukey()

Compares array keys, with an additional user made function check, and returns the differences. 

11.

array_fill()

Fills an array with values.

12.

array_filter()

Filters elements of an array through a user-made function.

13.

array_flip()

Exchanges all keys with their associated values in the array.

14.

array_intersect()

Compares array values and returns the matches

15.

array_intersect_assoc()

Compares array keys and values and returns the matches.

16.

array_intersect_key()

Compares array keys and returns the matches.

17.

array_intersect_uassoc()

Compares keys and values, with an additional user-made function check and return the matches.

18.

array_intersect_ukey()

Compares the keys, with an additional user-made function check and return the matches.

19.

array_key_exists()

Determines if the specified keys exists in the array.

20.

array_keys()

Returns all keys of an array.

21.

array_map()

Send each value of an array to a user-made function, which returns new values.

22.

array_merge() | array_merge_recursive()

Merges one or more arrays into one array.

23.

array_multisort()

Sorts multiple or multi-dimensional arrays.

24.

array_pad()

Inserts a specified number of items, with a specified value, to an array.

25.

array_pop()

Deletes the last element of an array.

26.

array_product()

Calculates the product of the values in an array.

27.

array_push()

Inserts one or more elements to the end of an array.

28.

array_rand()

Returns one or more random keys from an array.

     29.

array_reduce()

Returns an array as a string, using a user defined function.

30.

array_reverse()

Returns an array in the reverse order.

31.

array_search()

Searches an array for a given value and returns the key.

32.

array_shift()

Removes the first element from an array, and returns the value of the removed element.

33.

array_slice()

Removes and replaces specified elements of an array.

34.

array_splice()

Removes and replaces specified elements of an array

35.

array_sum()

Returns the sum of the values in an array.

36.

array_udiff()

Compares array values in a user-made function and returns an array.

37.

array_udiff_assoc()

Compares array keys, and compares array values in a user-made function, and returns an array.

38.

array_udiff_uassoc()

Compares array keys and array values in user-made functions, and returns an array. 

39.

array_uintersect()

Compares array values in a user-made function and returns an array.

40.

array_uintersect_assoc()

Compares array keys, and compares array values in a user-made function, and returns an array.

41.

array_uintersect_uassoc()

Compares array keys and array values is user-made functions, and returns an array.

42.

array_unique()

Removes duplicate values from an array.

43.

array_unshift()

Adds one or more elements to the beginning of an array.

44.

array_values()

Returns all the values of an array.

45.

array_walk()

Applies a user function to every member of an array.

46.

array_walk_recursive()

Applies a user function recursively to every member of an array.

47.

arsort()

Sorts an array in reverse order and maintains index association.

48.

asort()

Sorts an array and maintains index association.

49.

compact()

Create array containing variables and their values.

50.

count()

Counts elements in an array, or properties in an object.

51.

current()

Returns the current element in an array

52.

each()

Returns the current key and value pair from an array

53.

end()

Sets the internal pointer of an array to its last element.

54.

extract()

Imports variables into the current symbol table from an array.

55.

in_array()

Checks if a specified value exists in an array.

56.

key()

Fetches a key from an array.

57.

krsort()

Sorts an array by key in reverse order.

58.

ksort()

Sorts an array by key.

59.

list()

Assigns variables as if they were an array.

60.

natcasesort()

Sorts an array using a case insensitive.

61.

natsort()

Sorts an array

62.

next()

Advance the internal array pointer of an array

63.

pos()

Alias of current.

64.

prev()

Rewinds the internal array pointer.

65.

range()

Creates an array containing a range of elements.

66.

reset()

Sets the internal pointer of an array to its first element.

67.

rsort()

Sorts an array in reverse order.

68.

shuffle()

Shuffles an array

69.

sizeof()

Alias of count()

70.

sort()

Sorts an array

71.

uasort()

Sorts an array with a user-defined function and maintain index association.

72.

uksort()

Sorts an array by keys using a user-defined function

73.

usort()

Sorts an array by values using a user-defined function.

Array Constants

1.

CASE_LOWER

Used with array_change_key_case() to convert array keys to lowercase

2.

CASE_UPPER

Used with array_change_key_case() to convert array keys to uppercase

3. 

SORT_ASC

Used with array_multisort() to sort in ascending order

4.

SORT_DESC

Used with array_multisort() to sort in descending order

5.

SORT_REGULAR

Used to compare items normally

6.

SORT_NUMERIC

Used to compare items numerically

7.

SORT_STRING

Used to compare items as strings

8.

SORT_LOCALE_STRING

Used to compare items as strings, based on the current locale

9.

COUNT_NORMAL

Counts all elements in an array.

10.

COUNT_RECURSIVE

Recursively counts the elements in an array.

11.

EXTR_OVERWRITE

Imports variables from an array into the current symbol table.

12.

EXTR_SKIP

It is an extraction flag. If there is a collision, do not overwrite the existing variable.

13.

EXTR_PREFIX_SAME

If there is a collision, prefix the variable name with prefix.

14.

EXTR_PREFIX_ALL

Prefix all variable names with prefix.

15.

EXTR_PREFIX_INVALID

Only prefix invalid/numeric variable names with prefix.

16.

EXTR_PREFIX_IF_EXISTS

Only create prefixed variable names if the non-prefixed version of the same variable exists in the current symbol table.

17.

EXTR_IF_EXISTS

Only overwrite the variable if it already exists in the current symbol table, otherwise do nothing. This is useful for defining a list of valid variables and then extracting only those variables defined out of $_REQUEST.

18.

EXTR_REFS

Extracts variables as references. This means the values of the imported variables are still referencing the values of the array parameter. 

String Functions

Strings are a sequence of characters. It is a data type. It can be alphanumeric as well. Strings are created by declaring a variable and assigning string characters to it. String Functions allow us to manipulate and handle strings as required.

1.

addcslashes()

Returns a string with backslashes in front of the specified characters.

2.

addslashes()

Returns a string with backslashes in front of predefined characters.

3.

bin2hex()

Converts a string of ASCII characters to hexadecimal values.

4.

chop()

Alias of rtrim()

5.

chr()

Returns a character from a specified ASCII value.

6.

chunk_split()

Split a string into a series of smaller parts.

7.

convert_cyr_string()

Converts a string from one Cyrillic character-set to another.

8.

convert_uudecode()

Decodes a uuencoded string.

9.

convert_uuencode()

Encodes a string using the uuencode algorithm.

10.

count_chars()

Returns how many times an ASCII character occurs within a string and returns the information.

11.

crc32()

Calculates a 32-bit CRC for a string.

12.

crypt()

One-way string encryption (hashing)

13.

echo()

Outputs strings

14.

explode()

Breaks a string into an array.

15.

fprintf()

Writes a formatted string to a specified output stream.

16.

get_html_translation_table()

Returns the translation table used by htmlspecialchars() and htmlentities()

17.

hebrev()

Converts Hebrew text to visual text.

18.

hebrevc()

Converts Hebrew text to visual text and new lines(\n) into <br/>

19.

html_entity_decode()

Converts HTML entities to characters.

20.

htmlentities()

Converts characters to HTML entities.

21.

htmlspecialchars_decode()

Converts some predefined HTML entities to characters.

22.

htmlspecialchars()

Converts some predefined characters to HTML entities.

23.

implode()

Returns a string from the elements of an array.

24.

join()

Alias of implode()

25.

levenshtein()

Returns the Levenshtein distance between two strings.

26.

localeconv()

Returns locale numeric and monetary formatting information.

27.

ltrim()

Strips whitespaces from the left side of a string.

28.

md5()

Calculates the md5 hash of a string.

29.

md5_file()

Calculates the md5 hash of a file.

30.

metaphone()

Calculates the metaphone key of a string.

31.

money_format()

Returns a string formatted as a currency string.

32.

nl_langinfo()

Returns a specific local information.

33.

nl2br()

Inserts HTML line breaks in front of each newline in a string.

34.

number_format()

Formats a number with grouped thousands.

35.

ord()

Returns the ASCII value of the first character of a string.

36.

parse_str()

Parses a query string into variables.

37.

print()

Outputs a string.

38.

printf()

Outputs a formatted string.

39.

quoted_printable_decode()

Decodes a quoted-printable string.

40.

quotemeta()

Quotes meta-characters.

41.

rtrim()

Strips whitespace from the right side of a string.

42.

setlocale()

Sets locale information.

43.

sha1()

Calculates the SHA-1 hash of a string.

44.

sha1_file()

Calculates the SHA-1 hash of a file.

45.

similar_text()

Calculates the similarity between two strings.

46.

soundex()

Calculates the soundex key of a string

47.

sprintf()

Writes a formatted string to a variable.

48.

sscanf()

Parses input from a string according to a format.

49.

str_ireplace()

Replaces some characters in a string(case-insensitive)

50.

str_pad()

Pads a string to a new length.

51.

str_repeat()

Repeats a string a specified number of times.

52.

str_replace()

Replaces some characters in a string(case-sensitive)

53.

str_rot13()

Performs the ROT13 encoding on a string.

54.

str_shuffle()

Randomly shuffles all characters in a string.

55.

str_split()

Splits a string into an array.

56.

str_word_count()

Count the number of words in a string.

57.

strcasecmp()

Compares two strings (case-insensitive)

58.

strchr()

Finds the first occurrence of a string inside another string (alias of strstr())

59.

strcmp()

Compares two strings (case-sensitive)

60.

strcoll()

Locale based string comparison

61.

strcspn()

Returns the number of characters found in a string before any part of some specified characters are found.

62.

strip_tags()

Strips HTML and PHP tags from a string.

63.

stripcslashes()

Unquotes a string quoted with addcslashes()

64.

stripslashes()

Unquotes a string quoted with addslashes()

65.

stripos()

Returns the position of the first occurrence of a string inside another string (case-insensitive)

66.

stristr()

Finds the first occurrence of a string inside another string(case-insensitive)

67.

strlen()

Returns the length of a string

68.

strnatcasecmp()

Compares two strings

69.

strnatcmp()

Compares two strings

70.

strncasecmp()

String comparison of the first n characters (case -insensitive)

71.

strncmp()

String comparison of the first n characters (case – sensitive)

72.

strpbrk()

Searches a string for any of a set of characters.

73.

strpos()

Returns the position of the first occurrence of a string inside another string(case-sensitive)

74.

strrchr()

Finds the last occurrence of a string inside another string.

75.

strrev()

Reverses a string

76.

strripos()

Finds the position of the last occurrence of a string inside another string(case-insensitive)

77.

strrpos()

Finds the position of the last occurrence of a string inside another string (case – sensitive)

78.

strspn()

Returns the number of characters found in a string that contains only characters from a specified charlist.

79.

strstr()

Finds the first occurrence of a string inside another string(case-sensitive)

78.

strtok()

Splits a string into smaller strings.

79.

strtolower()

Converts a string to lowercase letters.

80.

strtoupper()

Converts a string to uppercase letters.

81.

strtr()

Translates certain characters in a string.

82.

substr()

Returns a part of a string.

83.

substr_compare()

Compares two strings from a specified start position (binary safe and optionally case-sensitive)

84.

substr_count()

Counts the number of times a substring occurs in a string.

85.

substr_replace()

Replaces a part of a string with another string.

86.

trim()

Strips whitespace from both sides of a string.

87.

ucfirst()

Converts the first character of a string to uppercase.

88.

ucwords()

Converts the first character of each word in a string to uppercase.

89.

vfprintf()

Writes a formatted string to a specified output stream.

90.

vprintf()

Outputs a formatted string.

91.

vsprintf()

Writes a formatted string to a variable.

92.

wordwrap()

Wraps a string to a given number of characters.

String Constants

1.

CRYPT_SALT_LENGTH

Contains the length of the default encryption method for the system. For standard DES encryption, the length is 2

2.

CRYPT_STD_DES

Set to 1 if the standard DES-based encryption with a 2 character salt is supported, 0 otherwise

3.

CRYPT_EXT_DES

Set to 1 if the extended DES-based encryption with a 9 character salt is supported, 0 otherwise

4.

CRYPT_MD5

Set to 1 if the MD5 encryption with a 12 character salt starting with $1$ is supported, 0 otherwise

5.

CRYPT_BLOWFISH

Set to 1 if the Blowfish encryption with a 16 character salt starting with $2$ or $2a$ is supported, 0 otherwise

6.

HTML_SPECIALCHARS

Converts some predefined characters to HTML entities.

7.

HTML_ENTITIES

Converts a special character in an input string into the form of an HTML character.

8.

ENT_COMPAT

Converts double quotes 

9.

ENT_QUOTES

Will convert both single and double quotes.

10.

ENT_NOQUOTES

Will leave both single and double quotes unconverted.

11.

ENT_IGNORE

Silently discard invalid code unit sequences instead of returning an empty string. Using this flag is discouraged as it may have security implications.

12.

ENT_SUBSTITUTE

Replace invalid code unit sequences with a Unicode Replacement Character U+FFFD (UTF-8) or &#xFFFD; (otherwise) instead of returning an empty string.

13.

ENT_DISALLOWED

Replace invalid code points for the given document type with a Unicode Replacement Character U+FFFD (UTF-8) or &#xFFFD; (otherwise) instead of leaving them as is. This may be useful, for instance, to ensure the well-formedness of XML documents with embedded external content.

14.

ENT_HTML401

Handle code as HTML 4.01.

15.

ENT_XML1

Handle code as XML 1.

16.

ENT_XHTML

Handle code as XHTML.

17.

ENT_HTML5

Handle code as HTML 5.

18.

CHAR_MAX

If an array element is equal to CHAR_MAX, no further grouping is done.

19.

LC_CTYPE

For character classification and conversion.

20.

LC_NUMERIC

Used for decimal separator.

21.

LC_TIME

For date and time formatting.

22.

LC_COLLATE

For string comparison.

23.

LC_MONETARY

For localeconv()

24.

LC_ALL

For all LC_ functions.

25.

LC_MESSAGES

For system responses.

26.

STR_PAD_LEFT

Pad left side of an input string.

27.

STR_PAD_RIGHT

Pad right side of an input string.

28.

STR_PAD_BOTH

Pad both sides of an input string.

Math Functions

Math functions are used to handle values within the range of integer and float types. 

1.

abs()

Returns the absolute value of a number.

2.

acos()

Returns the arccosine of a number.

3.

acosh()

Returns the inverse hyperbolic cosine of a number.

4.

asin()

Returns the arcsine of a number.

5.

asinh()

Returns the inverse hyperbolic sine of a number.

6.

atan()

Returns the arctangent of a number as a numeric value between: -pi/2 and +pi/2  radians.

7.

atan2()

Returns the angle theta of an (x,y) point as a numeric value between -pi and +pi radians.

8.

atanh()

Returns the inverse hyperbolic tangent of a number.

9.

base_convert()

Converts a number from one base to another.

10.

bindec()

Converts a binary number to a decimal number.

11.

ceil()

Returns the value of a number rounded upwards to the nearest integer.

12.

cos()

Returns the cosine of a number.

13.

cosh()

Returns the hyperbolic cosine of a number.

14.

decbin()

Converts a decimal number to a binary number.

15.

dechex()

Converts a decimal number to a hexadecimal number.

16.

decoct()

Converts a decimal number to an octal number.

17.

deg2rad()

Converts a degree to a radian number.

18.

exp()

Returns the value of E

19.

expm1()

Returns the value of E

20.

floor()

Returns the value of a number rounded downwards to the nearest integer.

21.

fmod()

Returns the remainder(modulo) of the division of the arguments.

22.

getrandmax()

Returns the maximum random number that can be returned by a call to the rand() function.

23.

hexdec()

Converts a hexadecimal number to a decimal number.

24.

hypot()

Returns the length of the hypotenuse of a right-angle triangle.

25.

is_finite()

Returns true if a value is a finite number.

26. is_infinite()

Returns true if a value is an infinite number.

27.

is_nan()

Returns true if a value is not a number

28.

lcg_value()

Returns a pseudo random number in the range of (0,1)

29.

log()

Returns the natural logarithm(base E) of a number.

30.

log10()

Returns the base-10 logarithm of a number.

31.

log1p()

Returns log(1+number)

32.

max()

Returns the number with the highest value of two specified numbers.

33.

min()

Returns the number with the lowest value of two specified numbers.

34.

mt_getrandmax()

Returns the largest possible value that can be returned by mt_rand()

35.

mt_rand()

Returns a random integer using Mersenne Twister algorithm.

36.

mt_srand()

Seeds the Mersenne Twister random number generator.

37.

octdec()

Converts an octal number to a decimal number.

38.

pi()

Returns the value of pi

39.

pow()

Returns the value is x to the power of y.

40.

rad2deg()

Converts a radian number to a degree

41.

rand()

Returns a random integer

42.

round()

Rounds a number to the nearest integer.

43.

sin()

Returns the sine of a number.

44.

sinh()

Returns the hyperbolic sine of a number.

45.

sqrt()

Returns the sqrt of a number.

46.

srand()

Seeds the random number generator.

47.

tan()

Returns the tangent of an angle.

48.

tanh()

Returns the hyperbolic tangent of an angle.

Math Constants

1.

M_E

Returns e (approx. 2.718)

2.

M_EULER

Returns Euler's constant (approx. 0.577)

3.

M_LNPI

Returns the natural logarithm of PI (approx. 1.144)

4.

M_LN2

Returns the natural logarithm of 2 (approx. 0.693)

5.

M_LN10

Returns the natural logarithm of 10 (approx. 2.302)

6.

M_LOG2E

Returns the base-2 logarithm of E (approx. 1.442)

7.

M_LOG10E

Returns the base-10 logarithm of E (approx. 0.434)

8.

M_PI

Returns PI (approx. 3.14159)

9.

M_PI_2

Returns PI/2 (approx. 1.570)

10.

M_PI_4

Returns PI/4 (approx. 0.785)

11.

M_1_PI

Returns 1/PI (approx. 0.318)

12.

M_2_PI

Returns 2/PI (approx. 0.636)

13.

M_SQRTPI

Returns the square root of PI (approx. 1.772)

14.

M_2_SQRTPI

Returns 2/square root of PI (approx. 1.128)

15.

M_SQRT1_2

Returns the square root of 1/2 (approx. 0.707)

16.

M_SQRT2

Returns the square root of 2 (approx. 1.414)

18

M_SQRT3

Returns the square root of 3 (approx. 1.732)

Date/Time Functions

The date/time functions allow getting the date and time from the server where the PHP script runs. These functions can also be used to format date/time functions as required.

1.

checkdate()

Validates a Gregorian Data

2.

date_default_timezone_get()

Returns the default time zone.

3.

date_default_timezone_set()

Sets the default time zone.

4.

date_sunrise()

Returns the time of sunrise for the time or location.

5.

date_sunset()

Returns the time of sunset for the time or location.

6.

date()

Formats a local time/date.

7.

getdate()

Returns an array that contains the date and time stamp information for a Unix timestamp.

8.

gettimeofday()

Returns an array that contains the current time information.

9.

gmdate()

Formats a GMT/UTC date/time

10.

gmmktime()

Returns the Unix timestamp for a GMT Table.

11.

gmstrftime()

Formats a GMT/UTC time/date according to locale settings.

12.

idate()

Formats a local time/date as an integer.

13.

localtime()

Returns an array that contains the time components of a Unix Timestamp.

14.

microtime()

Returns the current time in microseconds.

15.

mktime()

Returns the Unix timestamp for a date.

16.

strftime()

Formats the local time date according to locale settings.

17.

strptime()

Parses a time/date generated with strftime()

18.

strtotime()

Parses English textual date or time into a Unix timestamp.

19

time()

Returns the current time as a Unix timestamp.

Date/Time Constants

1.

DATE_ATOM

Atom (example: 2005-08-15T16:13:03+0000)

2.

DATE_COOKIE

HTTP Cookies (example: Sun, 14 Aug 2005 16:13:03 UTC)

3.

DATE_ISO8601

ISO-8601 (example: 2005-08-14T16:13:03+0000)

4.

DATE_RFC822

RFC 822 (example: Sun, 14 Aug 2005 16:13:03 UTC)

5.

DATE_RFC850

RFC 850 (example: Sunday, 14-Aug-05 16:13:03 UTC)

6.

DATE_RFC1036

RFC 1036 (example: Sunday, 14-Aug-05 16:13:03 UTC)

7.

DATE_RFC1123

RFC 1123 (example: Sun, 14 Aug 2005 16:13:03 UTC)

8.

DATE_RFC2822

RFC 2822 (Sun, 14 Aug 2005 16:13:03 +0000)

9.

DATE_RSS

RSS (Sun, 14 Aug 2005 16:13:03 UTC)

10.

DATE_W3C

World Wide Web Consortium (example: 2005-08-14T16:13:03+0000)

Calendar Functions

The Calendar extension contains functions that simplify the conversion between two different calendar formats.

1.

cal_days_in_month()

Returns the number of days in a month for a specified year and calendar

2.

cal_from_jd()

Converts a Julian day count into a date of a specified calendar.

3.

cal_info()

Returns information about a given calendar

4.

cal_to_jd()

Converts a date to Julian day count.

5.

easter_date()

Returns the Unix timestamp for midnight on Easter of a specified month.

6.

easter_days()

Returns the number of days after March 21, on which Easter falls for a specified year.

7.

FrenchToJD()

Converts a French Republican date to a Julian day count.

8.

GregorianToJD()

Converts a Gregorian Date to a Julian day count.

9.

JDDayOfWeek()

Returns the day of the week.

10.

JDMonthName()

Returns a month name.

11.

JDToFrench()

Converts a Julian day count to a French Republican date.

12.

JDToGregorian()

Converts a Julian day count to a Gregorian Date.

13.

jdtojewish()

Converts a Julian day count to a Jewish date.

14.

JDToJulian()

Converts a Julian day count to a Julian date.

15.

jdtounix()

Converts a Julian day count to a Unix timestamp.

16.

JewishToJD()

Converts a Jewish date to a Julian day count.

17.

JulianToJD()

Converts a Julian date to a Julian day count.

18.

unixtojd()

Converts a Unix timestamp to a Julian day count.

Calendar Constants

1.

CAL_GREGORIAN

Gregorian Calendar

2.

CAL_JULIAN

Julian Calendar

3.

CAL_JEWISH

Jewish Calendar

4.

CAL_FRENCH

French Republican Calendar.

5.

CAL_NUM_CALS

The number of available calendars.

6.

CAL_DOW_DAYNO

The day of the week as integer, where 0 means Sunday and 6 means Saturday.

7.

CAL_DOW_SHORT

The abbreviated English name of the day of the week.

8.

CAL_DOW_LONG

The English name of the day of the week.

9.

CAL_MONTH_GREGORIAN_SHORT

The abbreviated Gregorian month name.

10.

CAL_MONTH_GREGORIAN_LONG

The Gregorian month name.

11.

CAL_MONTH_JULIAN_SHORT

The abbreviated Julian month name.

12.

CAL_MONTH_JULIAN_LONG

The Julian month name.

13.

CAL_MONTH_JEWISH

The Jewish month name.

14.

CAL_MONTH_FRENCH

The French Republican month name.

15.

CAL_EASTER_DEFAULT

Calculate Easter for years before 1753 according to the Julian calendar, and for later years according to the Gregorian calendar.

16.

CAL_EASTER_ROMAN

Calculate Easter for years before 1583 according to the Julian calendar, and for later years according to the Gregorian calendar.

17.

CAL_EASTER_ALWAYS_GREGORIAN

Calculate Easter according to the proleptic Gregorian calendar.

18.

CAL_EASTER_ALWAYS_JULIAN

Calculate Easter according to the Julian calendar.

19.

CAL_JEWISH_ADD_ALAFIM_GERESH

Adds a geresh symbol (which resembles a single-quote mark) as thousands separator to the year number.

20.

CAL_JEWISH_ADD_ALAFIM

Adds the word alafim as thousands separator to the year number.

21.

CAL_JEWISH_ADD_GERESHAYIM

Add a gershayim symbol (which resembles a double-quote mark) before the final letter of the day and year numbers.

Directory Functions

The directory functions are used to retrieve information about directories and their contents.

1.

chdir()

Changes the current directory

2.

chroot()

Changes the root directory to the current process.

3.

dir()

Opens the directory handle and returns an object.

4.

closedir()

Closes the directory handle.

5.

getcwd()

Returns the current directory.

6.

opendir()

Open a directory handle.

7.

readdir()

Returns an entry from the directory handle.

8.

rewinddir()

Resets a directory handle.

9.

scandir()

Lists the files and directory inside a specified path.

Directory Constants

1.

DIRECTORY_SEPARATOR

In different OS there is different directory separator. In Windows it's \ in Linux it's /. DIRECTORY_SEPARATOR is constant with that OS directory separator. 

2.

PATH_SEPARATOR

Semicolon on windows, colon otherwise.

File System Functions

These functions allow to access and manipulate the filesystem. 

1.

basename()

Returns the filename component of a path.

2.

chgrp()

Changes the file group.

3.

chmod()

Changes the file mode

4.

chown()

Changes the file owner

5.

clearstatcache()

Clears the file status cache

6.

copy()

Copies a file

7.

delete()

Delete a file

8.

dirname()

Returns the directory name component of a path

9.

disk_free_space() | diskfreespace()

Returns the free space of a directory

10.

disk_total_space()

Returns the total size of a directory

11.

fclose()

Closes an open file

12.

feof()

Tests for end-of-file on an open file

13.

fflush()

Flushes buffered output to an open file.

14.

fgetc()

Returns a character from an open file

15.

fgetcsv()

Checks and parses a line in an open file.

16.

fgets()

Returns a line from an open file.

17.

fgetss()

Returns a line, with HTML and PHP tags removed, from an open file.

18.

file()

Reads a file into an array

19.

file_exists()

Checks whether or not a file or a directory exists.

20.

file_get_contents()

Reads a file into a string

21.

file_put_contents

Writes a string to a file

22.

fileatime()

Returns the last access time of a file

23.

filectime()

Returns the last change time of a file.

24.

filegroup()

Returns the group ID of a file

25.

fileinode()

Returns the inode number of a file

26.

filemtime()

Returns the last modification time of a file

27.

fileowner()

Returns the user ID(owner) of a file

28.

fileperms()

Returns the permissions of a file.

29.

filesize()

Returns the file size.

30.

filetype()

Returns the file type.

31.

flock()

Locks or releases a file.

32.

fnmatch()

Matches a filename or string against a specified pattern

33.

fopen()

Opens a file or URL

34.

fpassthru()

Reads from an open file, until EOF, and writes the result to the output buffer.

35.

fputcsv()

Formats a line as CSV and writes it to an open file.

36.

fputs()

Alias of fwrite.

37.

fread()

Reads from an open file.

38.

fscanf()

Parses input form an open file according to a specified format.

39.

fseek()

Seeks in an open file.

40.

fstat()

Returns information about an open file.

41.

ftell()

Returns the current position in an open file.

42.

ftruncate()

Truncates an open file to a specified length.

43.

fwrite()

Writes to an open file. 

44.

glob()

Returns an array of filenames/directories matching a specified pattern.

45.

is_dir()

Checks whether a file is a directory.

46.

is_executable()

Checks whether a file is executable.

47.

is_file()

Checks whether a file is a regular file.

48.

is_link()

Check whether a file is a link.

49.

is_readable()

Checks whether a file is readable.

50.

is_uploaded_file()

Checks whether a file was uploaded via HTTP POST

51.

is_writable()|is_writeable()

Checks whether a file is readable.

52.

link()

Creates a hard link

53.

linkinfo()

Returns information about a hard link.

54.

lstat()

Returns information about a file or symbolic link

55.

mkdir()

Creates a directory.

56.

move_uploaded_file()

Moves an uploaded file to a new location.

57.

parse_ini_file()

Parses a configuration file.

58.

pathinfo()

Returns information about a file path.

59.

pclose()

Closes a pipe opened by popen()

60.

popen()

Opens a pipe

61.

readfile()

Reads a file and writes it to the output buffer.

62.

readlink()

Returns the target of a symbolic link.

63.

realpath()

Returns the absolute pathname.

64.

rename()

Renames a file or directory.

65.

rewind()

Rewinds a file pointer.

66.

rmdir()

Removes an empty directory.

67.

set_file_buffer()

Sets the buffer size if an open file.

68.

stat()

Returns information about a file.

69.

symlink()

Creates a symbolic link

70.

tempnam() | tmpfile()

Creates a unique temporary file

71.

touch()

Sets access and modification time of a file.

72.

umask()

Changes file permissions for files.

73.

unlink()

Deletes a file.

File System Constants

1.

GLOB_BRACE

Expands {a,b,c} to match 'a', 'b', or 'c'

2.

GLOB_ONLYDIR

Return only directory entries which match the pattern

3.

GLOB_MARK

Adds a slash to each directory returned

4.

GLOB_NOSORT

Return files as they appear in the directory (no sorting). When this flag is not used, the path names are sorted alphabetically

5.

GLOB_NOCHECK

Return the search pattern if no files matching it were found

6.

GLOB_NOESCAPE

Backslashes do not quote metacharacters.

7.

GLOB_ERR

Stop on read errors (like unreadable directories), by default errors are ignored.

8.

PATHINFO_DIRNAME

Returns information about the path directory.

9.

PATHINFO_BASENAME

Returns information about the path basename.

10.

PATHINFO_EXTENSION

Returns information about the path extension.

11.

FILE_USE_INCLUDE_PATH

Search for the file in the include path.

12.

FILE_APPEND

Append a file to a file. The target file needs to be writable for this.

13.

FILE_IGNORE_NEW_LINES

Omit newline at the end of each array element.

14.

FILE_SKIP_EMPTY_LINES

Skips empty lines.

Zip Functions

These functions allow you to read zip files. The ZIP extension requires libzip which is a C library for reading, creating and modifying zip archives. 

1.

zip_close()

Closes a ZIP File

2.

zip_entry_close()

Closes an entry in the ZIP file

3.

zip_entry_compressedsize()

Returns compressed size of an entry in the ZIP file.

4.

zip_entry_compressionmethod()

Returns the compression method of an entry in the ZIP File. 

5.

zip_entry_filesize()

Returns the actual file size of an entry in the ZIP File.

6.

zip_entry_name()

Returns the name of an entry in the ZIP File.

7.

zip_entry_open()

Opens an entry in the ZIP File for reading.

8.

zip_entry_read()

Reads from an open entry in the ZIP File.

9.

zip_open()

Opens a ZIP File

10.

zip_read()

Reads the next entry in the ZIP File.

Filter Functions

These functions are used to validate and filter data coming from insecure input sources. These filter functions are enabled by default. 

1.

filter_has_var()

Checks if a variable of a specified input type exist.

2.

filter_id()

Returns the ID number of a specified filter.

3.

filter_input()

Get input from outside the script and filter it.

4.

filter_input_array()

Get multiple inputs from outside the script and filters them.

5.

filter_list()

Returns an array of all supported filters

6.

filter_var_array()

Get multiple variables and filter them.

7.

filter_var()

Get a variable and filter it.

Filter Constants

1.

FILTER_DEFAULT

Do nothing, optionally strip/encode special characters. Equivalent to FILTER_UNSAFE_RAW

2.

FILTER_FLAG_NONE

Allows no flags

3.

FILTER_FLAG_ALLOW_OCTAL

Only for inputs that starts with a zero (0) as octal numbers. This only allows the succeeding digits to be 0-7

4.

FILTER_FLAG_ALLOW_HEX

Only for inputs that starts with 0x/0X as hexadecimal numbers. This only allows succeeding characters to be a-fA-F0-9

5.

FILTER_FLAG_STRIP_LOW

Strip characters with ASCII value lower than 32

6.

FILTER_FLAG_STRIP_HIGH

Strip characters with ASCII value greater than 127

7.

FILTER_FLAG_ENCODE_LOW

Encode characters with ASCII value lower than 32

8.

FILTER_FLAG_ENCODE_HIGH

Encode characters with ASCII value greater than 127

9.

FILTER_FLAG_ENCODE_AMP

Encode &

10.

FILTER_FLAG_NO_ENCODE_QUOTES

Do not encode ' and "

11.

FILTER_FLAG_EMPTY_STRING_NULL

Not in use

12.

FILTER_FLAG_ALLOW_FRACTION

Allows a period (.) as a fractional separator in numbers

13.

FILTER_FLAG_ALLOW_THOUSAND

Allows a comma (,) as a thousands separator in numbers

14.

FILTER_FLAG_ALLOW_SCIENTIFIC

Allows an e or E for scientific notation in numbers

15.

FILTER_FLAG_PATH_REQUIRED

The URL must contain a path part

16.

FILTER_FLAG_QUERY_REQUIRED

The URL must contain a query string

17.

FILTER_FLAG_IPV4

Allows the IP address to be in IPv4 format

18.

FILTER_FLAG_IPV6

Allows the IP address to be in IPv6 format

19.

FILTER_FLAG_NO_RES_RANGE

Fails validation for the reserved IPv4 ranges: 0.0.0.0/8, 169.254.0.0/16, 127.0.0.0/8 and 240.0.0.0/4, and for the reserved IPv6 ranges: ::1/128, ::/128, ::ffff:0:0/96 and fe80::/10

20.

FILTER_FLAG_NO_PRIV_RANGE

Fails validation for the private IPv4 ranges: 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16, and for the IPv6 addresses starting with FD or FC

21.

FILTER_FLAG_EMAIL_UNICODE

Allows the local part of the email address to contain Unicode characters

22.

FILTER_REQUIRE_SCALAR

The value must be a scalar

23.

FILTER_REQUIRE_ARRAY

The value must be an array

24.

FILTER_FORCE_ARRAY

Treats a scalar value as an array with the scalar value as only element

25.

FILTER_NULL_ON_FAILURE

Return NULL on failure for unrecognized boolean values

26.

FILTER_VALIDATE_BOOLEAN

Validates a boolean

27.

FILTER_VALIDATE_EMAIL

Validates value as a valid email address

28.

FILTER_VALIDATE_FLOAT

Validates value as float

29.

FILTER_VALIDATE_INT

Validates value as integer

30.

FILTER_VALIDATE_IP

Validates value as IP address

31.

FILTER_VALIDATE_MAC

Validates value as MAC address

32.

FILTER_VALIDATE_REGEXP

Validates value against a regular expression

33.

FILTER_VALIDATE_URL

Validates value as URL

34.

FILTER_SANITIZE_EMAIL

Removes all illegal characters from an email address

35.

FILTER_SANITIZE_ENCODED

Removes/Encodes special characters

36.

FILTER_SANITIZE_MAGIC_QUOTES

Apply addslashes()

37.

FILTER_SANITIZE_NUMBER_FLOAT

Remove all characters, except digits, +- signs, and optionally .,eE

38.

FILTER_SANITIZE_NUMBER_INT

Removes all characters except digits and + - signs

39.

FILTER_SANITIZE_SPECIAL_CHARS

Removes special characters

40.

FILTER_SANITIZE_STRING

Removes tags/special characters from a string

41.

FILTER_SANITIZE_STRIPPED

Alias of FILTER_SANITIZE_STRING

42.

FILTER_SANITIZE_URL

Removes all illegal characters from s URL

43.

FILTER_UNSAFE_RAW

Do nothing, optionally strip/encode special characters

44.

FILTER_CALLBACK

Call a user-defined function to filter data

45.

INPUT_POST

POST variables

46.

INPUT_GET

GET variables

47.

INPUT_COOKIE

COOKIE variables

48.

INPUT_ENV

ENV variables

49.

INPUT_SERVER

SERVER variables

Mail Functions

The Mail function allows sending mail directly from script.

1.

ezmlm_hash()

Calculates the hash value by the EZMLM mailing list system.

2.

mail()

Allows you to send emails directly from a script.

FTP Functions

The FTP Functions give the client access to the file servers through the File Transfer Protocol(FTP). The FTP functions are used to open, login and close connections, upload, download, rename, delete and get information on files from file servers. 

1.

ftp_alloc()

Allocates space for a file to be uploaded to the FTP server.

2.

ftp_cdup()

Changes the current directory to the parent directory on the FTP server.

3.

ftp_chdir()

Changes the current directory on the FTP server

4.

ftp_chmod()

Sets the permissions on a file via FTP

5.

ftp_close()

Closes an FTP connection.

6.

ftp_connect()

Opens an FTP connection

7.

ftp_delete()

Deletes a file on the FTP server.

8.

ftp_exec()

Executes a program/command on the FTP server.

9.

ftp_fget()

Downloads a file from the FTP server and saves it to an open file.

10.

ftp_fput()

Uploads from an open file and saves it to a file on the FTP server.

11.

ftp_get_option()

Returns runtime behaviours of the FTP connection.

12.

ftp_get()

Downloads a file from the FTP server.

13.

ftp_login()

Logs on to an FTP connection

14.

ftp_mdtm()

Returns the last modified time of a specified file.

15.

ftp_mkdir()

Creates a new directory on the FTP server.

16.

ftp_nb_continue()

Continues retrieving/sending a file (non-blocking)

17.

ftp_nb_fget()

Downloads a file from the FTP server and saves it to an open file (non-blocking)

18.

ftp_nb_fput()

Uploads from an open file and saves it to a file on the FTP server (non-blocking)

19.

ftp_nb_get()

Downloads a file from the FTP server (non-blocking)

20.

ftp_nb_put()

Uploads a file to the FTP server (non-blocking)

21.

ftp_nlist()

Lists the files in a specified directory on the FTP server.

22.

ftp_pasv()

Turns passive mode on or off.

23.

ftp_put()

Uploads a file to the FTP server.

24.

ftp_pwd()

Returns the current directory name.

25.

ftp_quit()

Alias of ftp_close()

26.

ftp_raw()

Sends a raw command to the FTP server

27.

ftp_rawlist()

Returns a detailed list of files in the specified directory

28.

ftp_rename()

Renames a file or a directory on the FTP server.

29.

ftp_rmdir()

Removes a directory on the FTP server.

30.

ftp_set_option()

Sets runtime options for the FTP connection

31.

ftp_site()

Sends a SITE command to the server.

32.

ftp_size()

Returns the size of the specified file.

33.

ftp_ssl_connect()

Opens a secure SSL-FTP connection

34.

ftp_systype()

Returns the system type identifier of the FTP server.

FTP Constants

1.

FTP_ASCII | FTP_TEXT

It is the FTP transfer mode. 

2.

FTP_BINARY | FTP_IMAGE

It is the FTP transfer mode.

3.

FTP_TIMEOUT_SEC

Timeout used for network operations

4.

FTP_AUTOSEEK

Sets miscellaneous runtime FTP options.

5.

FTP_AUTORESUME

Automatically determine the resume position and start position for GET and PUT requests. FTP_AUTOSEEK needs to be enabled.

6.

FTP_FAILED

Asynchronous transfer has failed.

7.

FTP_FINISHED

Asynchronous transfer has completed.

8.

FTP_MOREDATA

Asynchronous transfer is in progress.

HTTP Functions

1.

header()

Sends a raw HTTP header to a client.

2.

headers_list()

Returns a list of response headers sent(or ready to send)

3.

headers_sent()

Checks if/where the HTTP headers have been sent.

4.

setcookie()

Sends an HTTP cookie to a client.

5.

setrawcookie()

Sends an HTTP cookie without URL encoding the cookie value.

Simple XML Functions

Allow us to easily manipulate and get XML Data. It gets an element’s name, attributes and textual content once the XML document’s structure or layout is known. Simple XML converts an XML document into a data structure that can be iterated through like arrays and objects.

1.

__construct()

Creates a new SimpleXML Element Object

2.

addAttribute()

Adds an attribute to the SimpleXML element

3.

addChild()

Adds a child element from the SimpleXML element.

4.

asXML()

Gets an XML string from a SimpleXML element.

5.

attributes()

Gets a SimpleXML element’s attributes.

6.

children()

Gets the children of a specified node.

7.

getDocNamespaces()

Gets the namespaces of an XML document.

8.

getName()

Gets the name of a SimpleXML element.

9.

getNamespace()

Gets the namespaces from XML data.

10.

registerXPathNamespace()

Creates a namespaces context for the next XPath query. 

11.

simplexml_import_dom()

Gets a SimpleXMLElement object from a DOM node.

12.

simplexml_load_file()

Gets a SimpleXMLElement object from an XML document.

13.

simplexml_load_string()

Gets a SimpleXMLElement  object from an XML string.

14.

xpath()

Runs an XPath query on XML data.

LIBXML Functions

These functions are used with SimpleXML, XSLT and DOM Functions. 

1.

libxml_clear_errors()

Clear libxml error buffer

2.

libxml_get_errors()

Retrieve array of errors

3.

libxml_get_last_error()

Retrieve last error from libxml

4.

libxml_set_streams_context()

Set the streams context for the next libxml document load or write.

5.

libxml_use_internal_errors()

Disable libxml errors and allow user to fetch error information as needed.

LIBXML Constants

1.

LIBXML_BIGLINES

Make line numbers greater than 65535 to be reported correctly

2.

LIBXML_COMPACT

Set small nodes allocation optimization. This may improve the application performance

3.

LIBXML_DOTTED_VERSION

Get dotted libxml version (e.g. 2.6.5 or 2.6.17)

4.

LIBXML_DTDATTR

Set default DTD attributes

5.

LIBXML_DTDLOAD

Load external subset

6.

LIBXML_DTDVALID

Validate with the DTD

7.

LIBXML_ERR_ERROR

Get recoverable errors

8.

LIBXML_ERR_FATAL

Get fatal errors

9.

LIBXML_ERR_NONE

Get no errors

10.

LIBXML_ERR_WARNING

Get simple warnings

11.

LIBXML_HTML_NOIMPLIED

Set HTML_PARSE_NOIMPLIED flag. This turns off automatic adding of implied html/body elements

12.

LIBXML_HTML_NODEFDTD

Set HTML_PARSE_NODEFDTD flag. This prevents a default doctype to be added, if no doctype is found

13.

LIBXML_NOBLANKS

Remove blank nodes

14.

LIBXML_NOCDATA

Set CDATA as text nodes

15.

LIBXML_NOEMPTYTAG

Change empty tags (e.g. <br/> to <br></br>), only available in the DOMDocument->save() and DOMDocument->saveXML() functions

16.

LIBXML_NOENT

Substitute entities

17.

LIBXML_NOERROR

Do not show error reports

18.

LIBXML_NONET

Stop network access while loading documents

19.

LIBXML_NOWARNING

Do not show warning reports

20.

LIBXML_NOXMLDECL

Drop the XML declaration when saving a document

21.

LIBXML_NSCLEAN

Remove excess namespace declarations

22.

LIBXML_PARSEHUGE

Set XML_PARSE_HUGE flag. This relaxes any hardcoded limit from the parser, such as maximum depth of a document or the size of text nodes

23.

LIBXML_PEDANTIC

Set XML_PARSE_PEDANTIC flag. This enables pedantic error reporting

24.

LIBXML_XINCLUDE

Use XInclude substitution

25.

LIBXML_VERSION

Get libxml version (e.g. 20605 or 20617)

26.

LIBXML_SCHEMA_CREATE

Create default or fixed value nodes during XSD schema validation

XML Parser Functions

XML is a data format intended for standardized structured document exchange. They help to parse XML documents. They however do not help to validate the documents. The XML parser functions enables us to create XML parsers and define handlers for XML events.

1.

utf8_decode()

Decodes an UTF-8 string to ISO-8859-1

2.

utf8_encode()

Encodes an ISO-8859-1 string to UTF-8

3.

xml_error_string()

Gets an error string from the XML parser.

4.

xml_get_current_byte_index()

Gets the current byte index from the XML parser.

5.

xml_get_current_column_number()

Gets the current column number from the XML parser.

6.

xml_get_current_line_number()

Gets the current line number from the XML parser

7.

xml_get_error_code()

Gets an error code from the XML parser.

8.

xml_parse()

Parses an XML document.

9.

xml_parse_into_struct()

Parse XML data into an array.

10.

xml_parser_create_ns()

Create an XML parser with namespace support.

11.

xml_parser_create()

Create an XML parser

12.

xml_parser_free()

Free an XML parser

13.

xml_parser_get_option()

Get options from an XML parser

14.

xml_parser_set_option()

Set options in an XML parser

15.

xml_set_character_data_handler()

Set handler function for character data.

16.

xml_set_default_handler()

Set default handler function.

17.

xml_set_element_handler()

Set handler function for start and end of element of elements.

18.

xml_set_end_namespace_decl_handler()

Set handler function for the end of namespace declarations

19.

xml_set_external_entity_ref_handler()

Set handler functions for external entities.

20.

xml_set_notation_decl_handler()

Set handler function for notation declarations.

21.

xml_set_object()

Use XML Parser within an object.

22.

xml_set_processing_instruction_handler()

Set handler function for processing instruction.

23.

xml_set_start_namespace_decl_handler()

Set handler function for the start of namespace declarations

24.

xml_set_unparsed_entity_decl_handler()

Set handler function for unparsed entity declarations.

XML Parser Constants

1.

XML_ERROR_NONE (integer)

2.

XML_ERROR_ASYNC_ENTITY (integer)

3.

XML_ERROR_NO_MEMORY (integer)

4.

XML_ERROR_BAD_CHAR_REF (integer)

5.

XML_ERROR_SYNTAX (integer)

6.

XML_ERROR_BINARY_ENTITY_REF (integer)

7.

XML_ERROR_NO_ELEMENTS (integer)

8.

XML_ERROR_ATTRIBUTE_EXTERNAL_ENTITY_REF (integer)

9.

XML_ERROR_INVALID_TOKEN (integer)

10.

XML_ERROR_MISPLACED_XML_PI (integer)

11.

XML_ERROR_UNCLOSED_TOKEN (integer)

12.

XML_ERROR_UNKNOWN_ENCODING (integer)

13.

XML_ERROR_PARTIAL_CHAR (integer)

14.

XML_ERROR_INCORRECT_ENCODING (integer)

15.

XML_ERROR_TAG_MISMATCH (integer)

16.

XML_ERROR_UNCLOSED_CDATA_SECTION (integer)

17.

XML_ERROR_DUPLICATE_ATTRIBUTE (integer)

18.

XML_ERROR_EXTERNAL_ENTITY_HANDLING (integer)

19.

XML_ERROR_JUNK_AFTER_DOC_ELEMENT (integer)

20.

XML_OPTION_CASE_FOLDING (integer)

21.

XML_ERROR_PARAM_ENTITY_REF (integer)

22.

XML_OPTION_TARGET_ENCODING (integer)

23.

XML_ERROR_UNDEFINED_ENTITY (integer)

24.

XML_OPTION_SKIP_TAGSTART (integer)

25.

XML_ERROR_RECURSIVE_ENTITY_REF (integer)

26.

XML_OPTION_SKIP_WHITE (integer)

MYSQLI Functions

These functions allow you to access MySQL database servers. 

1.

mysqli::$affected_rows

Gets the number of affected rows in the previous MySQL operation

2.

mysqli::autocommit()

Turns on or off auto committing database modifications

3.

mysqli::change_user()

Changes the user of the specified database connection.

4.

mysqli::character_set_name()

Returns the default character set for the database connection

5.

mysqli::$client_info

Get MySQL client info

6.

mysqli::$client_version

Returns the MySQL client version as a string.

7.

mysqli::close()

Closes a previously opened database connection.

8.

mysqli::commit()

Commits the current transaction.

9.

mysqli::$connect_errno

Returns the error code from the last connect call.

10.

mysqli::$connect_error

Returns a string description of the last connect error.

11.

mysqli::__construct()

Open a new connection to the MySQL server.

12.

mysqli::debug()

Performs debugging operations.

13.

mysqli::dump_debug_info()

Dump debugging information into the log.

14.

mysqli::$errno

Returns the error code for the most recent function call.

15.

mysqli::$error_list

Returns a list of errors from the last command executed.

16.

mysqli::$error

Returns a string description of the last error.

17.

mysqli::$field_count

Returns the number of columns for the most recent query.

18.

mysqli::get_charset()

Returns a character set object.

19.

mysqli::get_client_info()

Get MySQL client info.

20.

mysqli_get_client_stats()

Returns client per-process statistics

21.

mysqli_get_client_version()

Returns the MySQL client version as a string.

22.

mysqli::get_connection_stats()

Returns statistics about the client connection

23.

mysqli::$host_info

Returns a string representing the type of connection used.

24.

mysqli::$protocol_version

Returns the version of the MySQL protocol used.

25.

mysqli::$server_info

Returns the version of the MySQL Server.

26.

mysqli::$server_version

Returns the version of the MySQL server as an integer.

27.

mysqli::get_warnings()

Get the result of “SHOW WARNINGS”.

28.

mysqli::$info

Retrieves information about the most recently executed query.

29.

mysqli::init()

Initializes MYSQLi and returns a resource for use with mysqli_real connect()

30.

mysqli::$insert_id

Returns the auto generated id used in the last query.

31.

mysqli::kill()

Asks the server to kill a MySQL thread.

32.

mysqli::more_results()

Check if there are any more query results from a multi query.

33.

mysqli::multi_query()

Performs a query on a database.

34.

mysqli::next_result()

Prepare next result from a multi_query.

35.

mysqli::options()

Set options.

36.

mysqli::ping()

Pings a server connection, or tries to reconnect if the condition has gone down.

37.

mysqli::poll()

Poll connections.

38.

mysqli::prepare()

Prepare a SQL statement for execution.

39.

mysqli::query()

Performs a query on the database.

40.

mysqli::real_connect()

Opens a connection to a mysql server.

41.

mysqli::real_escape_string()

Escapes special characters in a string for use in a SQL statement, taking into account the current charset of the connection.

42.

mysqli::real_query()

Execute a SQL query.

43.

mysqli::reap_async_query()

Get the result from async query.

44.

mysqli::refresh()

Refreshes

45.

mysqli::rollback()

Rolls back current transaction.

46.

mysqli::rpl_query_type()

Returns RPL query type.

47.

mysqli::select_db()

Selects the default database for database queries.

48.

mysqli::send_query()

Send the query and return.

49.

mysqli::set_charset()

Sets the default client character set.

50.

mysqli::set_local_infile_default()

Unsets user defined handler for load local infile command.

51.

mysqli::set_local_infile_handler()

Se callback function for LOAD DATA LOCAL INFILE command.

52.

mysqli::$sqlstate

Returns the SQLSTATE error from previous MySQL operation.

53.

mysqli::ssl_set()

Used for establishing secure connections using SSL

54.

mysqli::stat()

Gets the current system status.

55.

mysqli::stmt_init()

Initializes a statement and returns an object for use with mysqli_stmt prepare.

56.

mysqli::store_result()

Transfers a result set from the last query.

57.

mysqli::$thread_id

Returns the thread ID for the current connection.

58.

mysqli::thread_safe()

Returns whether thread safety is given or not.

59.

mysqli::use_result()

Initiate a result set retrieval.

60.

mysqli::$warning_count

Returns the number of warnings from the last query for the given link.

MYSQLI Statements Constants

1.

mysqli_stmt::$affected_rows

Returns the total number of rows changed, deleted, or inserted by the last executed statement.

2.

mysqli_stmt::attr_get()

Used to get the current value of a statement attribute.

3.

mysqli_stmt::attr_set()

Used to modify the behaviour of a prepared statement.

4.

mysqli_stmt::bind_param()

Binds variables to a prepared statement as parameters.

5.

mysqli_stmt::bind_result()

Binds variables to a prepared statement for result storage.

6.

mysqli_stmt::close()

Closes a prepared statement.

7.

mysqli_stmt::data_seek()

Seeks to an arbitrary row in statement result set.

8.

mysqli_stmt::$errno

Returns the error code for the most recent statement call.

9.

mysqli_stmt::$error_list

Returns a list of errors from the last statement executed.

10.

mysqli_stmt::$error

Returns a string description for last statement error.

11.

mysqli_stmt::execute()

Executes a prepared query.

12.

mysqli_stmt::fetch()

Fetch results from a prepared statement into the bound variables.

13.

mysqli_stmt::$field_count

Returns the number of fields in the given statement.

14.

mysqli_stmt::free_result()

Frees stored result memory for the given statement handle.

15.

mysqli_stmt::get_result()

Gets a result from a prepared statement.

16.

mysqli_stmt::get_warnings()

Get result of SHOW WARNINGS

17.

mysqli_stmt::$insert_id

Get the ID generated from the previous insert operation.

18.

mysqli_stmt::more_results()

Check if there are any more query results from a multiple query.

19.

mysqli_stmt::next_result()

Reads the next result from a multiple query.

20.

mysqli_stmt::$num_rows

Return the number of rows in statements result set.

21.

mysqli_stmt::$param_count

Returns the number of parameters for the given statement.

22.

mysqli_stmt::prepare()

Prepares an SQL statement for execution.

23.

mysqli_stmt::reset()

Resets a prepared statement.

24.

mysqli_stmt::result_metadata()

Returns result set metadata from a prepared statement.

25.

mysqli_stmt::send_long_data()

Send data in blocks.

26.

mysqli_stmt::$sqlstate

Returns SQLSTATE error from previous statement operation.

27.

mysqli_stmt::store_result()

Transfers a result set from a prepared statement.

MYSQLI Result Class

1.

mysqli_result::$current_field

Get current field offset of a result pointer.

2.

mysqli_result::data_seek()

Adjusts the result pointer to an arbitrary row in the result.

3.

mysqli_result::fetch_all()

Fetches all result rows as an associative array, a numeric array, or both. 

4.

mysqli_result::fetch_array()

Fetch a result row as an associative, a numeric array, or both.

5.

mysqli_result::fetch_assoc()

Fetch a result row as an associative array.

6.

mysqli_result::fetch_field_direct()

Fetch meta-data for a single field.

7.

mysqli_result::fetch_field()

Returns the next field in the result set.

8.

mysqli_result::fetch_fields()

Returns an array of objects representing the fields in a result set.

9.

mysqli_result::fetch_object()

Returns the current row of a result se as an object.

10.

mysqli_result::fetch_row()

Get a result row as an enumerated array.

11.

mysqli_result::$field_count

Get the number of fields in a result.

12.

mysqli_result::field_seek()

Set result pointer to a specified field offset.

13.

mysqli_result::free()

Frees the memory associated with a result.

14.

mysqli_result::$lengths

Returns the length of the column of the current row in the result set.

15.

mysqli_result::$num_rows

Gets the number of rows in a result.

MYSQLI Driver Class

1.

mysqli_driver::embedded_server_end()

Stop embedded server

2.

mysqli_driver::embedded_server_start()

Initialize and start embedded server

3.

mysqli_driver::$report_mode

Enables or disables internal report functions

4.

mysqli_driver::$client_info

The Clients API header version.

5.

mysqli_driver::$client_version

The Client Version

6.

mysqli_driver::$driver_version

The MySQLi Driver Version

7.

mysqli_driver::$embedded

Whether MySQLi Embedded support is enabled.

8.

mysqli_driver::$reconnect

Allow or prevent reconnect 

9.

mysqli_driver::$report_mode

Set to MYSQLi_REPORT_OFF, MYSQLi_REPORT_ALL or any combination of MYSQLI_REPORT_STRICT (throw Exceptions for errors), MYSQLI_REPORT_ERROR (report errors) and MYSQLI_REPORT_INDEX (errors regarding indexes).

MYSQLI Warning Class

1.

mysqli_warning::__construct()

The _construct purpose

2.

mysqli_warning::next()

The next purpose

3.

mysqli_warning::$message

Message string

4.

mysqli_warning::$sqlstate

SQL State

5.

mysqli_warning::$errno

The MySQLi Driver Version

MYSQLi Constants

1.

MYSQLI_READ_DEFAULT_GROUP

Read options from the named group from my.cnf or the file specified with MYSQLI_READ_DEFAULT_FILE

2.

MYSQLI_READ_DEFAULT_FILE

Read options from the named option file instead of from my.cnf

3.

MYSQLI_OPT_CONNECT_TIMEOUT

Connect timeout in seconds

4.

MYSQLI_OPT_LOCAL_INFILE

Enables command LOAD LOCAL INFILE

5.

MYSQLI_INIT_COMMAND

Command to execute when connecting to MySQL server. Will automatically be re-executed when reconnecting.

6.

MYSQLI_CLIENT_SSL

Use SSL (encrypted protocol). This option should not be set by application programs; it is set internally in the MySQL client library

7.

MYSQLI_CLIENT_COMPRESS

Use compression protocol

8.

MYSQLI_CLIENT_INTERACTIVE

Allow interactive_timeout seconds (instead of wait_timeout seconds) of inactivity before closing the connection. The client's session wait_timeout variable will be set to the value of the session interactive_timeout variable.

9.

MYSQLI_CLIENT_IGNORE_SPACE

Allow spaces after function names. Makes all functions names reserved words.

10.

MYSQLI_CLIENT_NO_SCHEMA

Don't allow the db_name.tbl_name.col_name syntax.

11.

MYSQLI_CLIENT_MULTI_QUERIES

Allows multiple semicolon-delimited queries in a single mysqli_query() call.

12.

MYSQLI_STORE_RESULT

For using buffered resultsets

13.

MYSQLI_USE_RESULT

For using unbuffered result sets

14.

MYSQLI_ASSOC

Columns are returned into the array having the fieldname as the array index.

15.

MYSQLI_NUM

Columns are returned into the array having an enumerated index.

16.

MYSQLI_BOTH

Columns are returned into the array having both a numerical index and the fieldname as the associative index.

17.

MYSQLI_NOT_NULL_FLAG

Indicates that a field is defined as NOT NULL

18.

MYSQLI_PRI_KEY_FLAG

Field is part of a primary index

19.

MYSQLI_UNIQUE_KEY_FLAG

Field is part of a unique index.

20.

MYSQLI_MULTIPLE_KEY_FLAG

Field is part of an index.

21.

MYSQLI_BLOB_FLAG

Field is defined as BLOB

22.

MYSQLI_UNSIGNED_FLAG

Field is defined as UNSIGNED

23.

MYSQLI_ZEROFILL_FLAG

Field is defined as ZEROFILL

24.

MYSQLI_AUTO_INCREMENT_FLAG

Field is defined as AUTO_INCREMENT

25.

MYSQLI_TIMESTAMP_FLAG

Field is defined as TIMESTAMP

26.

MYSQLI_SET_FLAG

Field is defined as SET

27.

MYSQLI_NUM_FLAG

Field is defined as NUMERIC

28.

MYSQLI_PART_KEY_FLAG

Field is part of an multi-index

29.

MYSQLI_GROUP_FLAG

Field is part of GROUP BY

30.

MYSQLI_TYPE_DECIMAL

Field is defined as DECIMAL

31.

MYSQLI_TYPE_NEWDECIMAL

Precision math DECIMAL or NUMERIC field (MySQL 5.0.3 and up)

32.

MYSQLI_TYPE_BIT

Field is defined as BIT (MySQL 5.0.3 and up)

32.

MYSQLI_TYPE_TINY

Field is defined as TINYINT

34.

MYSQLI_TYPE_SHORT

Field is defined as SMALLINT

35.

MYSQLI_TYPE_LONG

Field is defined as INT

36.

MYSQLI_TYPE_FLOAT

Field is defined as FLOAT

37.

MYSQLI_TYPE_DOUBLE

Field is defined as DOUBLE

38.

MYSQLI_TYPE_NULL

 

39.

MYSQLI_TYPE_TIMESTAMP

Field is defined as TIMESTAMP

40.

MYSQLI_TYPE_LONGLONG

Field is defined as BIGINT

41.

MYSQLI_TYPE_INT24

Field is defined as MEDIUMINT

42.

MYSQLI_TYPE_DATE

Field is defined as DATE

43.

MYSQLI_TYPE_TIME

Field is defined as TIME

44.

MYSQLI_TYPE_DATETIME

Field is defined as DATETIME

45.

MYSQLI_TYPE_YEAR

Field is defined as YEAR

46.

MYSQLI_TYPE_NEWDATE

Field is defined as DATE

47.

MYSQLI_TYPE_INTERVAL

Field is defined as INTERVAL

48.

MYSQLI_TYPE_ENUM

Field is defined as ENUM

49.

MYSQLI_TYPE_SET

Field is defined as SET

50.

MYSQLI_TYPE_TINY_BLOB

Field is defined as TINYBLOB

51.

MYSQLI_TYPE_MEDIUM_BLOB

Field is defined as MEDIUMBLOB

52.

MYSQLI_TYPE_LONG_BLOB

Field is defined as LONGBLOB

53.

MYSQLI_TYPE_BLOB

Field is defined as BLOB

54.

MYSQLI_TYPE_VAR_STRING

Field is defined as VARCHAR

55.

MYSQLI_TYPE_STRING

Field is defined as CHAR or BINARY

56.

MYSQLI_TYPE_CHAR

Field is defined as TINYINT. For CHAR, see MYSQLI_TYPE_STRING

57.

MYSQLI_TYPE_GEOMETRY

Field is defined as GEOMETRY

58.

MYSQLI_NEED_DATA

More data available for bind variable

59.

MYSQLI_NO_DATA

No more data available for bind variable

60.

MYSQLI_DATA_TRUNCATED

Data truncation occurred. Available since PHP 5.1.0 and MySQL 5.0.5.

61.

MYSQLI_ENUM_FLAG

Field is defined as ENUM. Available since PHP 5.3.0.

62.

MYSQLI_REPORT_INDEX

Report if no index or bad index was used in a query.

63.

MYSQLI_REPORT_ERROR

Report errors from mysqli function calls.

64.

MYSQLI_REPORT_STRICT

Throw a mysqli_sql_exception for errors instead of warnings.

65.

MYSQLI_REPORT_ALL

Set all options on (report all).

66.

MYSQLI_REPORT_OFF

Turns reporting off.

67.

MYSQLI_DEBUG_TRACE_ENABLED

Is set to 1 if mysqli_debug() functionality is enabled.

68.

MYSQLI_SERVER_QUERY_NO_GOOD_INDEX_USED

 

69.

MYSQLI_SERVER_QUERY_NO_INDEX_USED

 

70.

MYSQLI_REFRESH_GRANT

Refreshes the grant tables.

71.

MYSQLI_REFRESH_LOG

Flushes the logs, like executing the FLUSH LOGS SQL statement.

72.

MYSQLI_REFRESH_TABLES

Flushes the table cache, like executing the FLUSH TABLES SQL statement.

73.

MYSQLI_REFRESH_HOSTS

Flushes the host cache, like executing the FLUSH HOSTS SQL statement.

74.

MYSQLI_REFRESH_STATUS

Reset the status variables, like executing the FLUSH STATUS SQL statement.

75.

MYSQLI_REFRESH_THREADS

Flushes the thread cache.

76.

MYSQLI_REFRESH_SLAVE

On a slave replication server: resets the master server information, and restarts the slave. Like executing the RESET SLAVE SQL statement.

77.

MYSQLI_REFRESH_MASTER

On a master replication server: removes the binary log files listed in the binary log index, and truncates the index file. Like executing the RESET MASTER SQL statement.

MISC Functions

All other categorized functions have been placed under this category. The behavior of these functions are affected by settings in the php.ini file. 

1.

connection_aborted()

Checks whether the client has disconnected.

2.

connection_status()

Returns the current connection status

3.

connection_timeout()

Deprecated since PHP 4.0.5

4.

constant()

Returns the value of a constant.

5.

define()

Defines a constant.

6.

defined()

Checks whether a constant exists.

7.

die()

Prints a message and exits the current script

8.

eval()

Evaluates a string as PHP Code 

9.

exit()

Prints a message and exits the current script.

10.

get_browser()

Returns the capabilities of the user’s browser

11.

highlight_file()

Outputs a file with the PHP syntax highlighted

12.

highlight_string()

Outputs a string with the PHP syntax highlighted.

13.

ignore_user_abort()

Sets whether a remote client can abort the running of a script.

14.

pack()

Packs data into a binary string

15.

php_strip_whitespace()

Removes the whitespaces and PHP Comments from the source code of a file.

16.

show_source()

Alias of highlight_file()

17.

sleep()

Delays code execution for a number of seconds.

18.

time_nanosleep()

Delays code execution for a number of seconds and nanoseconds.

19.

time_sleep_until()

Delays code execution until a specified time.

20.

uniqid()

Generates a unique ID

21.

unpack()

Unpacks data from a binary string.

22.

usleep()

Delays code execution for a number of microseconds.

MISC. Constants

1.

CONNECTION_ABORTED

Connection is aborted by the user or network error.

2.

CONNECTION_NORMAL

Connection is running normally.

3.

CONNECTION_TIMEOUT

Connection timed out.

4.

__COMPILER_HALT_OFFSET__

Determines the byte position of the data start.

Object-Oriented Programming

PHP codes can also be written in Object-Oriented Format. OOP is faster and easier to execute. The OOP structure makes the code easier to maintain, modify and debug. 

1.

__construct()

Classes with a constructor method call this method on each newly created object, so it is suitable for any initialization that the object may need before it is used. 

2.

__destruct()

Called as soon as there are no other references to a particular object, or in any order during the shutdown sequence.

3.

__callStatic()

Triggered when invoking inaccessible methods in a static context.

4.

__call()

Triggered when invoking inaccessible methods in an object context.

5.

__get()

Utilized for reading data from inaccessible properties.

6.

__set()

Run when writing data to inaccessible properties.

7.

__isset()

Triggered by calling isset() or empty() on inaccessible properties.

8.

__unset()

Invoked when unset() is used on inaccessible properties.

9.

__sleep()

The intended use of _sleep() is to commit pending data or perform similar cleanup tasks. Also, the function is useful if you have very large objects which do not need to be saved completely.

10.

__wakeup()

Used to re-establish database connections that may have been lost during serialization and perform other reinitialization tasks.

11.

__toString()

Allows a class to decide how it will react when it is treated like a string. 

12.

__invoke()

Called when a script tries to call an object as a function.

13.

__set_state()

Called for classes exported by var_export() since PHP 5.1.0

14.

__clone()

Once the cloning is complete, if a _clone() method is defined, then the newly created object’s _clone() method will be called, to allow any necessary properties that need to be changed.

Error Functions

These functions are used to handle errors and logging. The logging functions allow sending messages directly to other machines or systems while the error reporting functions allow customizing the level of error and feedback given. The behavior of the error functions are affected by the settings in the php.ini

1.

debug_backtrace()

Generates a backtrace

2.

debug_print_backtrace()

Prints a backtrace

3.

error_get_last()

Gets the last error occurred

4.

error_log()

Sends an error to a server error-log, to a file or to a remote destination.

5.

error_reporting()

Specifies which errors are reported.

6.

restore_error_handler()

Restores the previous error handler

7.

restore_exception_handler()

Restores the previous exception handler

8.

set_error_handler()

Sets a user defined function to handle errors.

9.

set_exception_handler()

Sets a user defined function to handle exceptions.

10.

trigger_error()

Creates a user-defined error message.

11.

user_error()

Alias of trigger error.

Error Constants

1.

E_ERROR1

Fatal run-time errors. Errors that cannot be recovered from. Execution of the script is halted

2.

E_WARNING2

Non-fatal run-time errors. Execution of the script is not halted

2.

E_PARSE4

Compile-time parse errors. Parse errors should only be generated by the parser

3.

E_NOTICE8

Run-time notices. The script found something that might be an error, but could also happen when running a script normally

4.

E_CORE_ERROR16

Fatal errors at PHP startup. This is like an E_ERROR in the PHP core

5.

E_CORE_WARNING32

Non-fatal errors at PHP startup. This is like an E_WARNING in the PHP core

6.

E_COMPILE_ERROR64

Fatal compile-time errors. This is like an E_ERROR generated by the Zend Scripting Engine

7.

E_COMPILE_WARNING128

Non-fatal compile-time errors. This is like an E_WARNING generated by the Zend Scripting Engine

8.

E_USER_ERROR256

Fatal user-generated error. This is like an E_ERROR set by the programmer using the PHP function trigger_error()

9.

E_USER_WARNING512

Non-fatal user-generated warning. This is like an E_WARNING set by the programmer using the PHP function trigger_error()

10.

E_USER_NOTICE1024

User-generated notice. This is like an E_NOTICE set by the programmer using the PHP function trigger_error()

11.

E_STRICT2048

Run-time notices. PHP suggest changes to your code to help interoperability and compatibility of the code

12.

E_RECOVERABLE_ERROR4096

Catchable fatal error. This is like an E_ERROR but can be caught by a user defined handle (see also set_error_handler())

13.

E_ALL6143

All errors and warnings, except of level E_STRICT

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Barnali Chanda

Barnali Chanda

Barnali is a software developer, who eventually transformed into a technical documentation writer with her continuous research and development skills. She is an expert in C, C++, PHP, Python and RDBMS. She makes sure to evolve with technology. Thus, trained in BI, she is a Data Science enthusiast and is on the verge to pursue a career in Data Science. View all posts by the Author

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