Online PHP editor | refs for UKZ2N

@ 2013-10-09T14:56:37Z

<?php
function permutation(array $arr)
{
    while($ele=array_shift($arr))
    {
        $x=$ele;
        echo $x."\n";
        foreach($arr as $rest)
        {
            $x.=" $rest";
            echo $x."\n";
        }
    }
}
permutation(array(1,2,3,4));