Basically. I have this query that is executed on a form submit.
$add_proc = mysql_query(" INSERT INTO `proc` (active, title, desc, notes, link, tags1, tags2, tags3)
VALUES ( '".$_POST['add_proc_active']."', '".$_POST['add_proc_title']."', '".$_POST['add_proc_desc']."', '".$_POST['add_proc_notes']."', '".$_POST['add_proc_link']."', '".$_POST['add_proc_tag1']."', '".$_POST['add_proc_tag2']."', '".$_POST['add_proc_tag3']."' )
Now.
The form doesn't require you to enter all 3 tags.
However, if someone doesn't fill in 1 or more of the tags fields, it need to set that value to NULL in the database.
Something to the effect of
VALUES ( if(isset($_POST['add_proc_tag1)) { '".$_POST['add_proc_tag1']."' } else { tags1=null } )
But obviously you can't put PHP in an SQL query.
Any ideas? :)