Imploded resultts?

Ok i have this SQL that inserts two vars into an art_cat table..

PHP Code:
$sql2 = mysql_query("INSERT INTO art_cat (sub_cat_id, art_id) VALUES ('$var', '$art_id')");

However, the var '$var' holds the imploded data, e.g

1_2_3_4_5

so when the data is entered into the DB, i get the following


art_id sub_cat_id

69 1_2_3_4
_____________________

I would like the infor to be added like this though

art_id sub_cat_id

69 1
69 2
69 3
69 4
______________________

could someone show me how i would need to alter my SQL for this to work.

would i need a 'for each' loop according to the $var variable, then for each number, insert the art_id and number.

this would make all my other code work correctly.
thanks.

Check the explode funciton:

http://ca2.php.net/explode