--TEST-- Bug #23650 (strip_tags() removes hyphens) --FILE-- <?php $str = <<< HERE 1:<!-- abc - --> 2:<!doctype -- > 3: 4:<abc - def> 5:abc - def 6:</abc> HERE; echo strip_tags($str); echo strip_tags($str, '<abc>'); ?> --EXPECT-- 1: 2: 3: 4: 5:abc - def 6: 1: 2: 3: 4:<abc - def> 5:abc - def 6:</abc>