$query = array(
	'SELECT' => 't.forum_id, t.id, t.last_post',
	'FROM' => 'topics AS t',
	'JOINS' =>
		array(
			array('INNER JOIN' => 'forums AS f',
				'ON' => 'f.id=t.forum_id'),
			array('LEFT JOIN' => 'forum_perms AS fp',
				'ON' => '(fp.forum_id=f.id AND fp.group_id=' . $forum_user['g_id'] . ')')
			),
	'WHERE' => '(fp.read_forum IS NULL OR fp.read_forum=1) AND t.last_post>' . $forum_user['last_visit'] .' AND t.moved_to IS NULL');