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# uksort

uksort -- Sort an array by keys using a user-defined comparison function

## Description

`void uksort`(array array, function cmp_function);

This function 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

      1
      2 function mycompare ($a, $b) {
      3     if ($a == $b) return 0;
      4     return ($a > $b) ? -1 : 1;
      5 }
      6 $a = array (4 => "four", 3 => "three", 20 => "twenty", 10 => "ten");
      7 uksort ($a, mycompare);
      8 while (list ($key, $value) = each ($a)) {
      9     echo "$key: $value\n";
     10 }
     11

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

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

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