I have a php code snippet like below :
function is_ancestor_of( $page_name = null, $post ) {
if(is_null($page_name))
return false;
// does
Escape special characters using mysql_real_escape_string(). You'd probaply be better off moving away from mysql_* functions though and start using PDO or mysqli_* for example.
Edit As mentioned in the comments, make sure you place the code as a string and that the DB field is the correct data type. Also, make sure you use mysql_real_escape_string() (if you insist on using mysql_*) on the whole string (or code).