List of All PHP Array Functions

1. List of All PHP Array Functions
Function Description Syntax
array array_change_key_case ( array
array_change_key_case Changes all keys in an array
$input [, int $case = CASE_LOWER ] )
array array_chunk ( array $input , int
array_chunk Split an array into chunks
$size [, bool $preserve_keys = false ] )
Creates an array by using one array array array_combine ( array $keys ,
array_combine
for keys and another for its values array $values )
array array_count_values ( array
array_count_values Counts all the values of an array
$input )
Computes the difference of arrays array array_diff_assoc ( array $array1
array_diff_assoc
with additional index check , array $array2 [, array $... ] )
Computes the difference of arrays array array_diff_key ( array $array1 ,
array_diff_key
using keys for comparison array $array2 [, array $... ] )
Computes the difference of arrays
array array_diff_uassoc ( array
with additional index check which is
array_diff_uassoc $array1 , array $array2 [, array $... ],
performed by a user supplied
callback $key_compare_func )
callback function
Computes the difference of arrays array array_diff_ukey ( array $array1 ,
array_diff_ukey using a callback function on the keys array $array2 [, array $ ... ], callback
for comparison $key_compare_func )
array array_diff ( array $array1 , array
array_diff Computes the difference of arrays
$array2 [, array $ ... ] )
Fill an array with values, specifying array array_fill_keys ( array $keys ,
array_fill_keys
keys mixed $value )
array array_fill ( int $start_index , int
array_fill Fill an array with values
$num , mixed $value )
Filters elements of an array using a array array_filter ( array $input [,
array_filter
callback function callback $callback ] )
Exchanges all keys with their
array_flip array array_flip ( array $trans )
associated values in an array
Computes the intersection of arrays array array_intersect_assoc ( array
array_intersect_assoc
with additional index check $array1 , array $array2 [, array $ ... ] )
Computes the intersection of arrays array array_intersect_key ( array
array_intersect_key
using keys for comparison $array1 , array $array2 [, array $ ... ] )

2. Function Description Syntax
Computes the intersection of arrays
array array_intersect_uassoc ( array
with additional index check,
array_intersect_uassoc $array1 , array $array2 [, array $ ... ],
compares indexes by a callback
callback $key_compare_func )
function
Computes the intersection of arrays array array_intersect_ukey ( array
array_intersect_ukey using a callback function on the keys $array1 , array $array2 [, array $... ],
for comparison callback $key_compare_func )
array array_intersect ( array $array1 ,
array_intersect Computes the intersection of arrays
array $array2 [, array $ ... ] )
Checks if the given key or index bool array_key_exists ( mixed $key ,
array_key_exists
exists in the array array $search )
array array_keys ( array $input [,
Return all the keys or a subset of the
array_keys mixed $search_value [, bool $strict =
keys of an array
false ]] )
Applies the callback to the elements array array_map ( callback $callback ,
array_map
of the given arrays array $arr1 [, array $... ] )
array array_merge_recursive ( array
array_merge_recursive Merge two or more arrays recursively
$array1 [, array $... ] )
array array_merge ( array $array1 [,
array_merge Merge one or more arrays
array $... ] )
bool array_multisort ( array &$arr [,
Sort multiple or multi-dimensional
array_multisort mixed $arg = SORT_ASC [, mixed $arg
arrays
= SORT_REGULAR [, mixed $... ]]] )
Pad array to the specified length with array array_pad ( array $input , int
array_pad
a value $pad_size , mixed $pad_value )
array_pop Pop the element off the end of array mixed array_pop ( array &$array )
Calculate the product of values in an
array_product number array_product ( array $array )
array
Push one or more elements onto the int array_push ( array &$array , mixed
array_push
end of array $var [, mixed $... ] )
Pick one or more random entries out mixed array_rand ( array $input [, int
array_rand
of an array $num_req = 1 ] )
Iteratively reduce the array to a mixed array_reduce ( array $input ,
array_reduce single value using a callback callback $function [, mixed $initial =
function NULL ] )
array array_replace_recursive ( array
Replaces elements from passed
array_replace_recursive &$array , array &$array1 [, array &$... ]
arrays into the first array recursively
)

3. Function Description Syntax
Replaces elements from passed array array_replace ( array &$array ,
array_replace
arrays into the first array array &$array1 [, array &$... ] )
Return an array with elements in array array_reverse ( array $array [,
array_reverse
reverse order bool $preserve_keys = false ] )
Searches the array for a given value mixed array_search ( mixed $needle ,
array_search and returns the corresponding key if array $haystack [, bool $strict = false ]
successful )
Shift an element off the beginning of
array_shift mixed array_shift ( array &$array )
array
array array_slice ( array $array , int
array_slice Extract a slice of the array $offset [, int $length [, bool
$preserve_keys = false ]] )
array array_splice ( array &$input , int
Remove a portion of the array and
array_splice $offset [, int $length = 0 [, mixed
replace it with something else
$replacement ]] )
Calculate the sum of values in an
array_sum number array_sum ( array $array )
array
Computes the difference of arrays array array_udiff_assoc ( array
array_udiff_assoc with additional index check, $array1 , array $array2 [, array $ ... ],
compares data by a callback function callback $data_compare_func )

4. Function Description Syntax
Computes the difference of arrays array array_udiff_uassoc ( array
with additional index check, $array1 , array $array2 [, array $ ... ],
array_udiff_uassoc
compares data and indexes by a callback $data_compare_func ,
callback function callback $key_compare_func )
Computes the difference of arrays by array array_udiff ( array $array1 ,
array_udiff using a callback function for data array $array2 [, array $ ... ], callback
comparison $data_compare_func )
Computes the intersection of arrays array array_uintersect_assoc ( array
array_uintersect_assoc with additional index check, $array1 , array $array2 [, array $ ... ],
compares data by a callback function callback $data_compare_func )
Computes the intersection of arrays array array_uintersect_uassoc ( array
with additional index check, $array1 , array $array2 [, array $ ... ],
array_uintersect_uassoc
compares data and indexes by a callback $data_compare_func ,
callback functions callback $key_compare_func )

5. Function Description Syntax
array array_uintersect ( array $array1 ,
Computes the intersection of arrays,
array_uintersect array $array2 [, array $ ... ], callback
compares data by a callback function
$data_compare_func )
Removes duplicate values from an array array_unique ( array $array [, int
array_unique
array $sort_flags = SORT_STRING ] )
Prepend one or more elements to the int array_unshift ( array &$array ,
array_unshift
beginning of an array mixed $var [, mixed $... ] )
array_values Return all the values of an array array array_values ( array $input )
bool array_walk_recursive ( array
Apply a user function recursively to
array_walk_recursive &$input , callback $funcname [, mixed
every member of an array
$userdata ] )
bool array_walk ( array &$array ,
Apply a user function to every
array_walk callback $funcname [, mixed
member of an array
$userdata ] )
array Create an array array array ([ mixed $... ] )
Sort an array in reverse order and bool arsort ( array &$array [, int
arsort
maintain index association $sort_flags = SORT_REGULAR ] )

6. Function Description Syntax
Sort an array and maintain index bool asort ( array &$array [, int
asort
association $sort_flags = SORT_REGULAR ] )
Create array containing variables and array compact ( mixed $varname [,
compact
their values mixed $... ] )
Count all elements in an array, or int count ( mixed $var [, int $mode =
count
properties in an object COUNT_NORMAL ] )
Return the current element in an
current mixed current ( array &$array )
array
Return the current key and value pair
each from an array and advance the array array each ( array &$array )
cursor
Set the internal pointer of an array to
end mixed end ( array &$array )
its last element
int extract ( array &$var_array [, int
Import variables into the current
extract $extract_type = EXTR_OVERWRITE [,
symbol table from an array
string $prefix ]] )

7. Function Description Syntax
bool in_array ( mixed $needle , array
in_array Checks if a value exists in an array
$haystack [, bool $strict = FALSE ] )
key Fetch a key from an array mixed key ( array &$array )
bool krsort ( array &$array [, int
krsort Sort an array by key in reverse order
$sort_flags = SORT_REGULAR ] )
bool ksort ( array &$array [, int
ksort Sort an array by key
$sort_flags = SORT_REGULAR ] )
Assign variables as if they were an array list ( mixed $varname [, mixed
list
array $... ] )
Sort an array using a case
natcasesort bool natcasesort ( array &$array )
insensitive "natural order" algorithm
Sort an array using a "natural order"
natsort bool natsort ( array &$array )
algorithm
Advance the internal array pointer of
next mixed next ( array &$array )
an array

8. Function Description Syntax
pos Alias of current()
prev Rewind the internal array pointer mixed prev ( array &$array )
Create an array containing a range of array range ( mixed $start , mixed
range
elements $limit [, number $step = 1 ] )
Set the internal pointer of an array to
reset mixed reset ( array &$array )
its first element
bool rsort ( array &$array [, int
rsort Sort an array in reverse order
$sort_flags = SORT_REGULAR ] )
shuffle Shuffle an array bool shuffle ( array &$array )
sizeof Alias of count()
bool sort ( array &$array [, int
sort Sort an array
$sort_flags = SORT_REGULAR ] )
Sort an array with a user-defined
bool uasort ( array &$array , callback
uasort comparison function and maintain
$cmp_function )
index association
Sort an array by keys using a user- bool uksort ( array &$array , callback
uksort
defined comparison function $cmp_function )
Sort an array by values using a user- bool usort ( array &$array , callback
usort
defined comparison function $cmp_function )