Shuffle arrays

$arr = array("a","b","c","d","e","f","g","h"); //
$aantal = count($arr) - 1;
$arr2 = $arr;
shuffle($arr);
for($i = 0;$i <= $aantal;$i++)
{
	echo $arr2[$i].'-'.$arr[$i].'<br />';
}

$arr = array("a","b","c","d","e","f","g","h"); //
$aantal = count($arr) - 1;
$arr2 = $arr;
shuffle($arr);
for($i = 0;$i <= $aantal;$i++)
{
	echo $arr2[$i].'-'.$arr[$i].'<br />';
}

<?php
function sort_real($array_1,$array_2) {
    shuffle($array_2);
    $valid = true;
    $output = array();
    for ($i=0;$i<sizeof($array_1);$i++) {
        if ($array_1[$i]==$array_2[$i]) {
            $valid = false;
        } else {
            $output[$array_1[$i]] = $array_2[$i];
        }
    }
    if ($valid) {
        return $output;
    } else {
        return sort_real($array_1,$array_2);
    }
}

$array = array(1,2,3,4);
$arr = sort_real($array, $array);

print_r($arr);
/* aantal outputs:
 * Array ( [1] => 4 [2] => 3 [3] => 2 [4] => 1 )
 * Array ( [1] => 4 [2] => 3 [3] => 1 [4] => 2 )
 * Array ( [1] => 2 [2] => 3 [3] => 4 [4] => 1 ) 
 */

?>

<?php
function sort_real($array_1,$array_2) {
    shuffle($array_2);
    $valid = true;
    $output = array();
    for ($i=0;$i<sizeof($array_1);$i++) {
        if ($array_1[$i]==$array_2[$i]) {
            $valid = false;
        } else {
            $output[$array_1[$i]] = $array_2[$i];
        }
    }
    if ($valid) {
        return $output;
    } else {
        return sort_real($array_1,$array_2);
    }
}
 
$array = array(1,2,3,4);
$arr = sort_real($array, $array);
 
print_r($arr);
/* aantal outputs:
 * Array ( [1] => 4 [2] => 3 [3] => 2 [4] => 1 )
 * Array ( [1] => 4 [2] => 3 [3] => 1 [4] => 2 )
 * Array ( [1] => 2 [2] => 3 [3] => 4 [4] => 1 ) 
 */
 
?>