php对数组内的元素进行随机调换

一个自定义的php数组元素随机调换的函数，php已经有一个内置的同样功能的函数shuffle($Array)，这个代码权当参考

// 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;
}
//使用范例：
/*
** 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
*/