PHP Array uasort() Function

Last Updated : 17 Mar 2025

The PHP uasort( ) function is used to sort an array by its values using a user-defined comparison function. This function was introduced in PHP 4.0.

Syntax

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

The uasort( ) function returns true on success or false on failure.

Output:

Array
(
    [b] => badminton
    [d] => cricket
    [c] => football
    [a] => tennis
)

Output:

Array
(
    [2] => tata
    [4] => ford
    [1] => datsun
    [5] => audi
)

Output:

Array
(
    [d] => coconut
    [b] => banana
    [a] => apple
)

Output:

Array
(
    [f] => 4
    [b] => 3
    [a] => 2
    [d] => 1
)

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