Updating multiple rows using select PHP and MySQL - php

Question

Below is the code where I am trying to change the values of one column in multiple rows but I am a little bit stuck.
File 1:
<form name="update-location" method="post" action="recibos_location_update.php">
<div align="right"><button type="submit">Actualizar Estado</button></div>
<hr />
<ul>
<?php
$get_logs = mysql_query("SELECT * FROM recibos ORDER BY id DESC");
while ($logs = mysql_fetch_array($get_logs)){
$serial = $logs['serial'];
$check = $logs['location'];
$problem = $logs['problem'];
?>
<li class="<?php
if ($check == $location1){echo 'recibos-container-shop-li';}
if ($check == $location2){echo 'recibos-container-haji-li';}
if ($check == $location3){echo 'recibos-container-return-li';} ?>">
<?php echo $serial . " | " . $logs['model'] . " | " . $problem; ?>
<div align="right">
<?php
if ($check != 'Returned'){
?>
<input type="hidden" name="serial[]" value="<?php echo $serial; ?>" />
<select name="location">
<option <?php if ($check == $location1){echo 'selected';} ?> value="<?php echo $location1; ?>" style="background: #fff8bf;">Mobils Calfont</option>
<option <?php if ($check == $location2){echo 'selected';} ?> value="<?php echo $location2; ?>" style="background: #ffc1bf;">Haji Jorda</option>
<option <?php if ($check == $location3){echo 'selected';} ?> value="<?php echo $location3; ?>"style="background: #ecffbf;">Devuelto</option>
</select>
<?php
}
else {
echo "<i><font color='#5e8029'>Devuelto</font></i>";
}
?>
</div>
</li>
<?php } ?>
</ul>
File 2
<?php
include "connect.php";
include "links.php";
foreach($_POST["serial"] as $serial){
$location = $_POST['location'];
echo $location . " " . $serial . "<br>";
}
mysql_query("UPDATE recibos SET location='$location' WHERE serial='$serial'");
//header("Location: " . $_SERVER['HTTP_REFERER']);
?>
and the output I am getting is:
Haji 900005
Haji 900004
Haji 900002
But for all 3 output lines, it should give different names as names in 3 select boxes were different.
What I need is for the process form to update every row with what value is contained in select box options.

Answer 1

html
<select name="location[]">
php
foreach($_POST["serial"] as $k=> $serial){
$location = $_POST['location'][$k];
mysql_query("UPDATE recibos SET location='$location' WHERE serial='$serial'");
}

Answer 2

foreach($_POST["serial"] as $serial){
$location = $_POST['location'];
echo $location . " " . $serial . "<br>";
mysql_query("UPDATE recibos SET location='$location' WHERE serial='$serial'");//update
}
// mysql_query("UPDATE recibos SET location='$location' WHERE serial='$serial'");