All combinations of strings

<?php

    function all($array, $partial, &$result) {

        if ($array == array()) {

            $result[] = implode(',', $partial);
            return;
        }
        for ($i = 0; $i < count($array); $i++) {

            $e = $array[$i];
            $a = $array;

            array_splice($a, $i, 1);

            foreach($e as $v) {

                $p = $partial;
                $p[] = $v;

                all($a, $p, $result);
            }
        }
    }

    $a = array(1, 2, 3);
    $b = array('foo', 'bar');
    $c = array('a', 'b');
    $params = array($a, $b, $c);

    $result = array();

    all($params, array(), $result);

    print_r($result);

?>