PHP Array usort() Function

Last Updated : 17 Mar 2025

The PHP usort( ) function is used to sort an array by its value using a user-supplied comparison function. If the array you wish to sort needs to be sorted by some non-trivial criteria, you should use this function. This function was introduced in PHP 4.0.

Syntax

Parameter

Parameter	Description	Is compulsory
array	Specifies the array to be sorted.	compulsory
user_defined_function	This function is a comparison function and it is used to compare values and sort the array. This function returns three types of values. If a=b, return 0 If a>b, return 1 If a<b, return -1	Optional

Return type

The usort( ) function returns true on success and false on failure.

Example 1

Output:

Array
(
    [0] => denmark
    [1] => bangladesh
    [2] => australia
)

Example 2

Output:

Array
(
    [0] => 8
    [1] => 11
    [2] => 56
    [3] => 96
)

Example 3

Output:

Array
(
    [0] => c++
    [1] => csharp
    [2] => java
    [3] => php
)

Example 4

Output:

Array
(
    [0] => aajtak
    [1] => abp
    [2] => ndtv
    [3] => zee news
)

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