使用php和mysql使用for循环更新记录

Question

每当我尝试使用for循环更新多于一行的记录时，它只会更新记录的第一行，但是当我仅更新一行时。很好。

我将赞赏一种解决方案或更好的方法。 谢谢。

$select_ids = $conn->query("SELECT id FROM `pet_medicals_treat` WHERE med_id = '$id'");

$count = $select_ids->num_rows;
$row_id = $select_ids->fetch_array(MYSQLI_NUM);

for ($i = 0; $i < $count; $i++) {
    if (trim($_POST['pet_treat'][$i]) != '') {
        $rows = $row_id[$i];
        $pet_treat = $_POST['pet_treat'][$i];
        $pres_one = $_POST['pres_one'][$i];
        $pres_two = $_POST['pres_two'][$i];
        $pres_three = $_POST['pres_three'][$i];
        $pres_qty = $_POST['med_qty'][$i];
        $query = $conn->query("UPDATE pet_medicals_treat SET pet_treat='$pet_treat',pres_one='$pres_one',
        pres_two='$pres_two',pres_three='$pres_three',pres_qty='$pres_qty' WHERE  id ='$rows'");
    }
}