PHP built-in array functions

PHP has a built-in great support for the array to work with. There are numerous inbuilt array and string functions – like array_chunk, array_combine, array_filter, array_reverse, compact etc. Here is the list

	Function Name	Description
1.	array	creates an array
2.	array_fill	fills array with values
3.	array_sum	calculates the sum of array values
4.	asort	sort the array and maintains index association
5.	arsort	sorts the array in reverse order, maintaining index association
6.	sort	sorts the array
7.	rsort	sorts the array in reverse order
8.	uasort	sorts the array with a user-defined comparison function
9.	uksort	sorts the array by keys using the user-defined comparison function
10.	usort	sorts the array by values using the user-defined comparison function
11.	krsort	sorts the array by key in reverse order
12.	ksort	sorts the array by key
13.	natsort	sorts an array using a natural order algorithm
14.	natcasesort	sorts an array using a case-insensitive natural order algorithm
15.	range	creates an array containing a range of elements
16.	shuffle	shuffles array’s elements
17.	key	gets the key from the associative array
18.	in_array	checks if a value exists in array
19.	sizeof	counts the elements in the array
20.	count	counts the elements in the array
21.	array_key_exists	checks if the given key exists in the array
22.	array_keys	returns the keys in the array
23.	array_pop	pops the element off the end of the array
24.	array_push	pushes one or more elements at the end of array
25.	next	advances the array pointer of the array
26.	current	returns the current element of the array
27.	pos	returns the current element of the array
28.	prev	moves the array pointer back on the element
29.	end	sets the array pointer to the last element
30.	reset	sets the pointer of an array to its first elements
31.	compact	creates the array containing variables and their values
32.	extract	imports variable into the current symbol table from an array
33.	list	assigns variables as if they were an array
34.	array_merge	merges two or more arrays
35.	array_flip	exchanges all keys with their associated values in the array
36.	array_chunk	splits an array into chunks
37.	array_rand	picks one or more random elements out of the array
38.	array_search	searches the array for a given value and returns the corresponding key
39.	array_count_values	counts the values in an array
40.	array_diff	computes the difference of arrays
41.	array_filter	filters elements of an array using a callback function
42.	array_intersect	computes the intersection of arrays
43.	array_intersect_assoc	compute the intersection of arrays with additional values in an array
44.	array_combine	creates an array by using one array for keys and another for values
45.	array_diff_assoc	computes the difference of two arrays with additional index check
46.	array_unique	removes duplicate elements from an array
47.	array_walk	calls a user-supplied function on every member of an array
48.	array_values	returns all values of an array
49.	array_udiff	computes the difference between arrays by using a callback function
50.	array_map	applies the callback to the elements of the given array
51.	array_multisort	sorts multiple or multidimensional arrays
52.	array_pad	pads array to the specified length with a value
53.	array_reverse	returns an array with elements in reverse order
54.	array_shift	shifts an element of the beginning of an array
55.	array_slice	extracts a slice of the array
56.	array_splice	removes part of the array and replaces it with something else
57.	implode	implodes an array into a string
58.	explode	explodes a string into an array

Some example

<?php

$arr=array('a','b','c','d','e','e');

echo '$arr=array("a","b","c","d","e","e")<br>';

// pops an element from end of array
echo 'array_pop($arr) = ' . array_pop($arr)."<br>"; 

// search
echo 'array_search("c",$arr) = ' . array_search('c',$arr)."<br>"; 

// picks random element's key
echo 'array_rand($arr) = ' . $arr[array_rand($arr)]."<br>"; 

// count the elements of array
echo 'count($arr) = ' . count($arr)."<br>"; 

// checks if the key exists and returns Boolean
echo 'array_key_exists("3",$arr)='.array_key_exists("3",$arr);

Output

$arr=array("a","b","c","d","e","e")
array_pop($arr) = e
array_search("c",$arr) = 2
array_rand($arr) = e
count($arr) = 5
array_key_exists("3",$arr) = 1

Tags - PHP