0){ if(in_array($_GET['product_id'],$_SESSION['compare'])){ print "Ýòîò òîâàð áûë äîáàâëåí ðàíåå äëÿ ñðàâíåíèÿ!"; } elseif(count($_SESSION['compare'])>1){ print "Äëÿ ñðàâíåíèÿ óæå äîáàâëåííî äâà òîâàðà!"; } else{ $_SESSION['compare'][] = $_GET['product_id']; print "Òîâàð äîáàâëåí äëÿ ñðàâíåíèÿ"; } } ?>