Say you have a $_POST array and and you don't know if magic quotes is on:

Then simply call this routine and your entire array is reslashed if magic quotes are off or its left alone if they are turned on.

array_walk($_POST, 'reslash_multi');

function reslash_multi(&$val,$key)
{
   if (is_array($val)) array_walk($val,'reslash_multi',$new);
   else {
      $val = reslash($val);
   }
}

function reslash($string)
{
   if (!get_magic_quotes_gpc())$string = addslashes($string);
   return $string;
}