Sorting parameter arrays and filtering mysql query

Hi,

I have an mysql query which need to be filtered by the values of an url parameter that looks like this: <url>?featuresId=18, 2, 50

I have the array below to sort my values:

------------------

$temp=explode(',', $HTTP_GET_VARS['featuresId']);
foreach($temp as $index=>$value)
{
      if(is_int($value))
      {
            $temp[$index]=(int)$value;
      }
      else
      {
            unset($temp[$index]);
      }
}
asort($temp);
$get_features_query = "select * from features where feature_name like '%|" . implode("|%|", $temp) . "|%'";

-------------------------------------

The thing is i need the query to be filtered by feature_name like this:

$get_features_query = "select * from features where feature_name like %|2|%|18|%|50|%;

Any ideas how can i get to the bottom of this?

Thanks