PHP Array Functions

PHP Array Constants

Sr.No	Constant & Description
1	CASE_LOWER Used with array_change_key_case() to convert array keys to lower case
2	CASE_UPPER Used with array_change_key_case() to convert array keys to upper case
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
10	COUNT_RECURSIVE
11	EXTR_OVERWRITE
12	EXTR_SKIP
13	EXTR_PREFIX_SAME
14	EXTR_PREFIX_ALL
15	EXTR_PREFIX_INVALID
16	EXTR_PREFIX_IF_EXISTS
17	EXTR_IF_EXISTS
18	EXTR_REFS

List of Functions

PHP − indicates the earliest version of PHP that supports the function.

Sr.No	Function & Description	PHP
1	array() Create an array	3
2	array_change_key_case() Returns an array with all keys in lowercase or uppercase	4
3	array_chunk() Splits an array into chunks of arrays	4
4	array_combine() Creates an array by using one array for keys and another for its values	5
5	array_count_values() Returns an array with the number of occurrences for each value	4
6	array_diff() Compares array values, and returns the differences	4
7	array_diff_assoc() Compares array keys and values, and returns the differences	4
8	array_diff_key() Compares array keys, and returns the differences	5
9	array_diff_uassoc() Compares array keys and values, with an additional user-made function check, and returns the differences	5
10	array_diff_ukey() Compares array keys, with an additional user-made function check, and returns the differences	5
11	array_fill() Fills an array with values	4
12	array_fill_keys() Fill an array with values, specifying keys	5
13	array_filter() Filters elements of an array using a user-made function	4
14	array_flip() Exchanges all keys with their associated values in an array	4
15	array_intersect() Compares array values, and returns the matches	4
16	array_intersect_assoc() Compares array keys and values, and returns the matches	4
17	array_intersect_key() Compares array keys, and returns the matches	5
18	array_intersect_uassoc() Compares array keys and values, with an additional user-made function check, and returns the matches	5
19	array_intersect_ukey() Compares array keys, with an additional user-made function check, and returns the matches	5
20	array_key_exists() Checks if the specified key exists in the array	4
21	array_keys() Returns all the keys of an array	4
22	array_map() Sends each value of an array to a user-made function, which returns new values	4
23	array_merge() Merges one or more arrays into one array	4
24	array_merge_recursive() Merges one or more arrays into one array	4
25	array_multisort() Sorts multiple or multi-dimensional arrays	4
26	array_pad() Inserts a specified number of items, with a specified value, to an array	4
27	array_pop() Deletes the last element of an array	4
28	array_product() Calculates the product of the values in an array	5
29	array_push() Inserts one or more elements to the end of an array	4
30	array_rand() Returns one or more random keys from an array	4
31	array_reduce() Returns an array as a string, using a user-defined function	4
32	array_reverse() Returns an array in the reverse order	4
33	array_search() Searches an array for a given value and returns the key	4
34	array_shift() Removes the first element from an array, and returns the value of the removed element	4
35	array_slice() Returns selected parts of an array	4
36	array_splice() Removes and replaces specified elements of an array	4
37	array_sum() Returns the sum of the values in an array	4
38	array_udiff() Compares array values in a user-made function and returns an array	5
39	array_udiff_assoc() Compares array keys, and compares array values in a user-made function, and returns an array	5
40	array_udiff_uassoc() Compares array keys and array values in user-made functions, and returns an array	5
41	array_uintersect() Compares array values in a user-made function and returns an array	5
42	array_uintersect_assoc() Compares array keys, and compares array values in a user-made function, and returns an array	5
43	array_uintersect_uassoc() Compares array keys and array values in user-made functions, and returns an array	5
44	array_unique() Removes duplicate values from an array	4
45	array_unshift() Adds one or more elements to the beginning of an array	4
46	array_values() Returns all the values of an array	4
47	array_walk() Applies a user function to every member of an array	3
48	array_walk_recursive() Applies a user function recursively to every member of an array	5
49	arsort() Sorts an array in reverse order and maintain index association	3
50	asort() Sorts an array and maintain index association	3
51	compact() Create array containing variables and their values	4
52	count() Counts elements in an array, or properties in an object	3
53	current() Returns the current element in an array	3
54	each() Returns the current key and value pair from an array	3
55	end() Sets the internal pointer of an array to its last element	3
56	extract() Imports variables into the current symbol table from an array	3
57	in_array() Checks if a specified value exists in an array	4
58	key() Fetches a key from an array	3
59	krsort() Sorts an array by key in reverse order	3
60	ksort() Sorts an array by key	3
61	list() Assigns variables as if they were an array	3
62	natcasesort() Sorts an array using a case insensitive "natural order" algorithm	4
63	natsort() Sorts an array using a "natural order" algorithm	4
64	next() Advance the internal array pointer of an array	3
65	pos() Alias of current()	3
66	prev() Rewinds the internal array pointer	3
67	range() Creates an array containing a range of elements	3
68	reset() Sets the internal pointer of an array to its first element	3
69	rsort() Sorts an array in reverse order	3
70	shuffle() Shuffles an array	3
71	sizeof() Alias of count()	3
72	sort() Sorts an array	3
73	uasort() Sorts an array with a user-defined function and maintain index association	3
74	uksort() Sorts an array by keys using a user-defined function	3
75	usort() Sorts an array by values using a user-defined function