trouble in updating multiple rows in mysql db - php

Question

can someone tell me were I wrote wrong ? this code shows data from database but when I press submit it just reload the page and none of those field's update in database ...
shall I change variables in update query to for example : $_POST['name']
<?php
$host="localhost"; // Host name
$username="username"; // Mysql username
$password="password"; // Mysql password
$db_name="db"; // Database name
$tbl_name="test"; // Table name
// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");
$sql="SELECT * FROM $tbl_name";
$result=mysql_query($sql);
// Count table rows
$count=mysql_num_rows($result);
?>
<table width="500" border="0" cellspacing="1" cellpadding="0">
<form name="form1" method="POST" action="">
<tr>
<td>
<table width="500" border="0" cellspacing="1" cellpadding="0">
<tr>
<td align="center"><strong>Id</strong></td>
<td align="center"><strong>Name</strong></td>
<td align="center"><strong>Lastname</strong></td>
<td align="center"><strong>mid</strong></td>
</tr>
<?php
while($rows=mysql_fetch_array($result)){
$id[]=$rows['id'];
?>
<tr>
<td align="center">
<input name="id[]" type="text" id="id" value="<? echo $rows['id']; ?>">
</td>
<td align="center">
<input name="name[]" type="text" id="name" value="<? echo $rows['name']; ?>">
</td>
<td align="center">
<input name="lastname[]" type="text" id="lastname" value="<? echo $rows['lastname']; ?>">
</td>
<td align="center">
<input name="midmark[]" type="text" id="midmark" value="<? echo $rows['midmark']; ?>">
</td>
</tr>
<?
}
?>
<tr>
<td colspan="4" align="center"><input type="submit" name="Submit" value="Submit"></td>
</tr>
</table>
</td>
</tr>
</form>
</table>
<?php
if(isset($_POST['submit'])){
for($i=0;$i<$count;$i++){
$sql1=mysql_query("UPDATE $tbl_name SET name='$name[$i]', lastname='$lastname[$i]', midmark='$midmark[$i]' WHERE id='$id[$i]' ");
$result1=mysql_query($sql1);
}
}
if(isset($result1)){
header("location:multiple.php");
}
mysql_close();
?>

Answer 1

Try this, hope it'll help you.
if(isset($_POST['Submit']))
{
for($i=0;$i<$count;$i++)
{
$sql1=mysql_query("UPDATE `".$tbl_name."` SET name='".magic($_REQUEST['name'][$i])."', lastname='".magic($_REQUEST['lastname'][$i])."', midmark='".magic($_REQUEST['midmark'][$i])."' WHERE id='".magic($_REQUEST['id'][$i])."' ");
$result1=mysql_query($sql1);
}
}
function magic($value)
{
if( get_magic_quotes_gpc() )
$value = stripslashes( $value );
if( function_exists( "mysql_real_escape_string" ) )
$value = mysql_real_escape_string( $value );
else
$value = addslashes( $value );
return $value;
}

Answer 2

Try putting a '.' between the variables in your SQL string and the text and using single quotes - it may be trying to evaluate both parts of $name[$i]
, e.g.
'UPDATE '.$tbl_name.' SET name=\''.$name[$i].' ...etc
Also, always echo the SQL string before the query when testing to see what it will do

Answer 3

display and input using:-
<tr>
<td align="center">
<input name="data[<? echo $rows['id']; ?>][name]" type="text" id="name" value="<? echo $rows['name']; ?>">
</td>
<td align="center">
<input name="data[<? echo $rows['id']; ?>][lastname]" type="text" id="lastname" value="<? echo $rows['lastname']; ?>">
</td>
<td align="center">
<input name="data[<? echo $rows['id']; ?>][midmark]" type="text" id="midmark" value="<? echo $rows['midmark']; ?>">
</td>
</tr>
then process using:-
<?php
if(isset($_POST['submit']))
{
while(list($index,$record)=each($_POST['data']))
{
$sql=mysql_query("UPDATE $tbl_name SET name='".mysql_real_escape_string($record['name'])."', lastname='".mysql_real_escape_string($record['lastname'])."', midmark='".mysql_real_escape_string($record['nmidmarkame'])." WHERE id=".intval($index));
$result1=mysql_query($sql1);
}
}
?>

Answer 4

Your post variables are set wrong.
first of all your if statements, post['submit'] is lowercase, it needs to be the same as in the form:
isset($_POST['Submit'])
Then you need to read the rest of the post values and store them in variables or at least reference them properly:
$sql1=mysql_query("UPDATE $tbl_name SET name='$name[$i]', lastname='$lastname[$i]', midmark='$midmark[$i]' WHERE id='$id[$i]' ");
Should become:
$name = $_POST['name[$i]'];
$lastname = $_POST['lastname[$i]'];
$sql1=mysql_query("UPDATE $tbl_name SET name='$name', lastname='$lastname', ...