MySQL UPDATE using PHP function call

[admin]

Hi, I wonder if you can help?I a newbie to PHP and I'm having a problem with running an update query which modifed a field via a function call.The function strips leading "http://", trailing "index.htm(l)" etc from a URL - to tidy up entries in a links database. The function is:function url_strip($arg_url) .....And works correctly when run against individual strings and updates of individual records.However, when I use the following mysql call, it does not affect any change to the "url" field in the "links" table. $result = mysql_db_query(reviews, "UPDATE links SET url = url_strip(url)");Is this because functions cannot be applied withing the SQL statement and if this is the case, what would you recommend to perform this update?Thanks.