   #PHP Manual Array Functions uasort usort

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                                    uksort

   (PHP 3>= 3.0.4, PHP 4 )
   uksort --  Sort an array by keys using a user-defined comparison
   function

Description

   void uksort ( array array, callback cmp_function)

   uksort() will sort the keys of an array 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.

   Example 1. uksort() example
   <?php
   function cmp($a, $b) {
       if ($a == $b) {
           return 0;
       }
       return ($a > $b) ? -1 : 1;
   }
   $a = array(4 => "four", 3 => "three", 20 => "twenty", 10 => "ten");
   uksort($a, "cmp");
   while (list($key, $value) = each($a)) {
       echo "$key: $value\n";
   }
   ?>

   This example would display:
20: twenty
10: ten
4: four
3: three

   See also usort(), uasort(), sort(), asort(), arsort(), ksort(),
   natsort(), and rsort().
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