Update multiple rows at once - php

Question

I have this code which permits me to display all the data in the database as a textarea, I need to update them by clicking a update button!
Based on this one, is supposed to make me edit them, but when i click submit it doesn't...
<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>Email</strong></td>
</tr>
<?php
while($rows=mysql_fetch_array($result)){
?>
<tr>
<td align="center">
<? $id[]=$rows['id']; ?>
<? 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="email[]" type="text" id="email" value="<? echo $rows['email']; ?>">
</td>
</tr>
<?php
}
?>
<tr>
<td colspan="4" align="center">
<input type="submit" name="Submit" value="Submit"/>
</td>
</tr>
</table>
</td>
</tr>
</form>
</table>
<?php
// Check if button name "Submit" is active, do this
if($Submit)
{
for($i=0;$i<$count;$i++)
{
$sql1="UPDATE $tbl_name SET name='$name[$i]', lastname='$lastname[$i]', email='$email[$i]' WHERE id='$id[$i]'";
$result1=mysql_query($sql1);
}
}
if($result1)
{
header("location:update_multiple.php");
}

Answer 1

Yes because you forget your id's
<? $id[]=$rows['id']; ?> cannot be passed like that
<input type="hidden" name="id[]" value ="<?php echo $rows['id']; ?>" /><? echo $rows['id']; ?>
and script if($Submit){ should be if($_POST['Submit'] != ''){

Answer 2

You aren't defining $Submit in your post, so the stuff in the { ... } is never executed.
You should try something like this for your update:
if(isset($_POST[$name]))
{
// update stuff
}
In your code, as the if statement never executes, $result is never set, so the user isn't redirected away - it will just show the same page each time.

Answer 3

To check if a post occur when clicking a button should be set as follow:
In the <form>tag add the following
<form name="form1" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
And lastly, where you check if the button was clicked:
if(isset($_POST['Submit'])) {
//Update fields
}
Remember that the submit button name field is case sensitive in php