PHP + MySQL - Form cannot update multiples tables at a time - php

Question

I'm having bad time to update multiple tables from a form. I've done the query and checked for errors using (or die), but it seems that there are no errors in my MySQL codes. I can update the main table's data, but I can't update the other table. I'm suspecting that my form fields have some problem. This is my form codes :
<?php
$sql= "SELECT * FROM client WHERE resID=".$_GET["resID"];
$rs = mysql_query($sql) or die($sql."<br/><br/>".mysql_error());
$sqlM= "SELECT * FROM menu WHERE resID=".$_GET["resID"];
$rsM = mysql_query($sqlM) or die($sqlM."<br/><br/>".mysql_error());
$i = 0;
echo '<table width="50%">';
echo '<tr>';
echo '<td>ID</td>';
echo '<td>Name</td>';
echo '<td>Edit</td>';
echo '</tr>';
echo "<form name='form_update' method='post' action='client_admin_post.php'>\n";
$f=mysql_fetch_array($rs);echo '<tr>';
echo "<td>Res ID :</td>";
echo "<td>{$f['resID']}<input type='hidden' name='resID' value='{$f['resID']}' /></td>";
echo '</tr>';
++$i;
echo '<tr>';
echo "<td>Restaurant Name :</td>";
echo "<td><input type='text' size='40' name='resName' value='{$f['resName']}' /></td>";
echo '</tr>';
++$i;
while ($fM = mysql_fetch_array($rsM)) {
echo '<tr>';
echo "<td>Menu :</td>";
echo "<td><input type='text' size='40' name='mname[$i]' value='{$fM['name']}' /></td>";
echo "<td>{$fM['id']}<input type='hidden' name='mid[$i]' value='{$fM['id']}' /></td>";
echo '</tr>';
++$i;
}
echo '<tr>';
echo "<td><input type='submit' value='submit' /></td>";
echo '</tr>';
echo "</form>";
echo '</table>';
?>
This is my POST codes :
<?php
//session_start();
include_once("connection.php");
$resID= $_POST["resID"];
$resName= $_POST["resName"];
$sql = "UPDATE client ".
"SET resName = '$resName' ".
"WHERE resID = '$resID' " ;
mysql_query($sql) or die ('query failed:' . mysql_error());
$size = count($_POST['mname']);
$i = 0;
while ($i < $size) {
$name= $_POST['mname'][$i];
$id = $_POST['mid'][$i];
$sqlM = "UPDATE menu SET name = '$name' WHERE id = '$id' LIMIT 1";
mysql_query($sqlM) or die ("Error in query: $sqlM");
echo "$name<br /><br /><em>Updated!</em><br /><br />";
++$i;
}
?>
As you guys know, one restaurant got many menus. I can edit the main restaurant info, but I can't edit the menus. Please help me. Really appreciate your help. Thanks :D

Answer 1

You ++$i at least twice before outputing it as $mname index. So $_POST['mname'] would have indices 2 .. count_of_rows+1. Your while() ignores this fact and counts 0 .. size.
If you had all warnings turned on (as you should) you would get a warning indicating that invalid index 0 is used on line starting "$name= $_POST..." and you would have been able to figure out from there.