Online PHP editor | refs for RFbZa

@ 2014-01-14T04:47:54Z

<?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"));