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PHP uksort() Function Usage and Example

　The uksort() function sorts the keys in the array using a user-defined comparison function

Syntax

uksort　(　$array,　$cmp_function　)

Definition and Usage

The uksort() function sorts the array by element key using a user-defined comparison function.

Parameter

Serial Number	Parameters and Description
1	array(Required) It specifies an array.
2	cmp_function(Required) If the function is defined, it is used to compare the values and sort them. The function must return-1、0 or1，this method can work normally. It should be written to accept two parameters for comparison, and its working method should be similar to the following− If a = b, then return 0 If a > b, then return1 If a < b, then return-1

Return Value

Returns TRUE on success, FALSE on failure.

Online Example

Example

<?php
　　　function　cmp_function($a,　$b)　{
　　　　　　if　($a　==　$b)　return　0;
　　　　　　return　($a　>　$b)　?　-1　:　1;
　　　}
　　　
　　　$input　=　array("d"=>"lemon",　"a"=>"orange",　"b"=>"banana"　);
　　　uksort($input,　"cmp_function");
　　　
　　　print_r($input);
?>

Test and see‹/›

Output Result：

Array　(　[d]　=>　lemon　[b]　=>　banana　[a]　=>　orange　)

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