Hashing Class

<?php
    final class sec
    {
        public function hash($string, $salt1='', $salt2='', $hash='')
        {
            if(empty($salt1))
            {
                $h = $this->randHash();
                $s = array(
                        $this->randSalt(),
                        $this->randSalt()
                      );
                $string = $s[0] . wordwrap($string, strlen($string) / 2, $s[1]) . $s[0];
                $string = hash($h, $string);
                return array(
                        'string' => $string,
                        'salt1'  => $s[0],
                        'salt2'  => $s[1],
                        'hash'   => $h
                        );
            }
            else
            {
                $string = $salt1 . wordwrap($string, strlen($string) / 2, $salt2) . $salt1;
                return ( string ) hash($hash, $string);
            }
        }
        private function randHash()
        {
            $h = hash_algos();
            return $h[array_rand($h)];
        }
        private function randSalt()
        {
            $l = array_merge(
                        range('a', 'z'),
                        range('A', 'Z'),
                        range(0, 9),
                        array('!', '"', '�', '$', '%', '^', '&', '*', '(', ')', '[', ']', ':', '{', '}', '~', '#', '|', '\', '@', ';', '.', ',', '<', '>', '/', '?', '+', '=', '_', '-')
                    );
            $tmp = NULL;
            for($i = 0; $i <= mt_rand(5, 12); $i++)
            {
                $tmp .= $l[array_rand($l)];
            }
            return ( string ) $tmp;
        }
    }