WADecrypt method for PHP

function WADecrypt($src, $key){
  $pkey = $key;
  while (strlen($pkey)<16)
    $pkey .= '0';
  $data = explode('|',$src);
  $iv = $data[0];
  $enc = base64_decode($data[1]);
  $dec = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $pkey, $enc, MCRYPT_MODE_CBC, $iv);
  $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, 'cbc');
  $pad = ord($dec[($len = strlen($dec)) - 1]);
  return substr($dec, 0, strlen($dec) - $pad);
}