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Random Seeded Array Shuffle

/ Published in: PHP
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Repeatable Fisher Yates Array Shuffle based on given random string. If no seed is provided the current second will be used (not to use as a pure random shuffle... based on microseconds)

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  1. function fyshuffle(&$items,$seedstring) {
  2.    if (!$seedstring) {
  3.       $seedval = time();
  4.    } else {
  5.       if (is_numeric($seedstring)) {
  6.           $seedval = $seedstring;
  7.       } else {
  8.       for($i=0;$i<=strlen($seedstring);$i++) {
  9.           $seedval += ord($seedstring[$i]);
  10.       }
  11.    }
  12.  
  13.    srand($seedval);
  14.    for ($i = count($items) - 1; $i > 0; $i--) {
  15.       $j = @rand(0, $i);
  16.       $tmp = $items[$i];
  17.       $items[$i] = $items[$j];
  18.       $items[$j] = $tmp;
  19.    }
  20. }

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