PHP update SQL from multiple HTML checkbox - php

Question

So, I need to make sure this sets the right parameters to the DB when pressing the buttons. I just want to get the calls and comparisons right so it does what it should when I hit the buttons. There should be one delete button for each row from database, and update page when I press it.
It should be possible to update the text/numbers in the forms presented by MySQL by changing the forms and press Save-button, then refresh the page.
$counter = 1;
if(isset($_POST['save']) and something is changed from the forms compared to DB) {
Update MySQL
Refresh page
<script>
window.location.replace("thispage.php");
</script>
}
if(isset($_POST['del'])) {
DELETE MySQL
Refresh page
<script>
window.location.replace("thispage.php");
</script>
}
echo "<tr><td>ID</td><td>Namn</td><td>Platser</td><td>Fullbokad</td><td>Ta bort</td></tr>";
$sqlListSections = "SELECT * FROM avdelningar WHERE user = {$_SESSION['id']}";
$queryListSections = mysqli_query($mysqli, $sqlListSections);
$del = [];
while($rowListSections = mysqli_fetch_array($queryListSections))
{
if($counter%2)
{
echo "\n<tr bgcolor=#F1F1F2>\n\n";
}else
{
echo "\n<tr bgcolor=#FFFFFF>\n\n";
}
$counter++;
echo "
<td>".$rowListSections['id']."</td>
<td>
<input type=text value=".$rowListSections['namn']."></td>
<td>
<input type=text value=".$rowListSections['platser']."></td>
<td>";
if($rowListSections['prio'] == 1)
{
echo "<select name=platser>
<option selected value=".$rowListSections['prio'].">".$rowListSections['prio']."</option>
<option value='0'>0</option>".$rowListSections['prio'];
}elseif($rowListSections['prio'] == 0)
{
echo "<select name=platser>
<option selected value=".$rowListSections['prio'].">".$rowListSections['prio']."</option>
<option value='1'>1</option>".$rowListSections['prio'];
}
echo "</td>
<td>
<form method=post action=thispage.php>
<input type=submit value=Delete name=del>";
</td>
</form>
</tr>";
}
echo "<form method=post action=thispage.php>
<input type=submit value=Save name=save>";
`

Answer 1

in your checkbox change naming as array.
<input type=checkbox name="del[]" value={$rowListSections['id']}>
like
echo $rowListSections["id"].' '.$rowListSections["namn"].' '.$rowListSections["platser"].' '.
$rowListSections["prio"].'';
and in your if(isset($_POST)) you can get a del array so you can loop this array like below.
foreach($del as $val){
$id = $val;
$sql_query_for_update = "update table_name set field = 1 where id= '$id' ";
}