MySQL unique key error

[The Little Guy]

I have a mysql unique index on two columns:

UNIQUE KEY `page_id` (`page_id`,`tag_id`)

 

I have a mysql query like this:

mysql_query("insert into link_tags (page_id, tag_id) values ($page_id, $tag_id)");

 

If I run that, what would be the best way for php not to fail if the key already exists?

 

within a while loop, would this be best?

if(mysql_query("insert into link_tags (page_id, tag_id) values ($page_id, $tag_id)"))
continue;

 

Or would the code above (first code) be sufficient enough?