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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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