php自定义函数实现对数组内元素进行随机调换的功能

// I noticed that there is already a built-in function that
// does the same - so don't use mine ;-)
//
// --> shuffle($Array);
//
// http://de2.php.net/manual/de/function.shuffle.php
//
function RandomizeArray($array){
  // error check:
  $array = (!is_array($array)) ? array($array) : $array;
  $a = array();
  $max = count($array) + 10;
  while(count($array) > 0){    
    $e = array_shift($array);
    $r = rand(0, $max);
    // find a empty key:
    while (isset($a[$r])){
      $r = rand(0, $max);
    }    
    $a[$r] = $e;
  }
  ksort($a);
  $a = array_values($a);
  return $a;
}

/*
** Example:
*/
$test_array = array('why','dont','visit','www','jonas','john','de',':-)');
print implode(", ", $test_array);
print "\n";
print implode(", ", RandomizeArray($test_array));
/*
Example output:
why, dont, visit, www, jonas, john, de, :-)
www, de, jonas, john, visit, why, :-), dont
*/