Arraying Field PHP

Ok in Mysql I have a field group_links with content such as add_news, add_project, edit_news, edit_project on and on. Ok well I was going to array this info but im guessing I have lost my mind because I have forgotted how to break the field group_links into seperate values so i can array them. For Example:

$query = mysql_query(BLAH);
$row = mysql_fetch_array();
foreach( $row['group_links'] as $k => $v ){

This doesn’t work because it doesn’t break appart the string $row[‘group_links’] . How do i go about breaking the string into different parts.