functions/array.php3

   1 <?
   2    function ary_sort($ary,$col, $dir = 1){
   3       // The globals are used because USORT determines what is passed to comp2
   4       // These should be $this->col and $this->dir in a class
   5       // Would beat using globals
   6       if(!is_array($col)){
   7          $col = array("$col");
   8       }
   9       $GLOBALS["col"] = $col;  // Column or Columns as an array
  10       $GLOBALS["dir"] = $dir;  // Direction, a positive number for ascending a negative for descending
  11
  12       function comp2($a,$b,$i = 0) {
  13          global $col;
  14          global $dir;
  15          $c = count($col) -1;
  16          if ($a["$col[$i]"] == $b["$col[$i]"]){
  17             $r = 0;
  18             while($i < $c && $r == 0){
  19                $i++;
  20                $r = comp2($a,$b,$i);
  21             }
  22          } elseif($a["$col[$i]"] < $b["$col[$i]"]){
  23             $r = -1 * $dir; // Im not sure why you must * dir here, but it wont work just before the return...
  24          } else {
  25             $r = 1 * $dir;
  26          }
  27          return $r;
  28       }
  29
  30       usort($ary,comp2);
  31       return $ary;
  32    }
  33 ?>