PHP - Function uksort()


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Syntax

uksort ( $array, $cmp_function )

Definition and Usage

The uksort() function sorts an array by the element keys using user defined comparison function.

Parameters

Sr.No Parameter & Description
1

array

Required. Specifies an array.

2

cmp_function

Required. Use if defined function to compare values and to sort them.

The function must return -1, 0, or 1 for this method to work correctly. It should be written to accept two parameters to compare, and it should work something like this −

  • If a = b, return 0
  • If a > b, return 1
  • If a < b, return -1

Return Value

Returns TRUE on success or FALSE on failure.

Example

Try out following example −

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

This will produce the following result −

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

php_function_reference.htm

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