Mira la diferencias..
Código PHP:
<?php
$host="localhost"; // Host name
$username=""; // Mysql username
$password=""; // Mysql password
$db_name=""; // Database name
$tbl_name="test_mysql"; // Table name
// Connect to server and select databse.
mysql_connect($host, $username, $password)or die("cannot connect");
mysql_select_db($db_name)or die("cannot select DB");
$sql="SELECT * FROM test_mysql";
$result=mysql_query($sql);
// Count table rows
$count=mysql_num_rows($result);
?>
<table width="500" border="0" cellspacing="1" cellpadding="0">
<form name="form1" method="post" action="<?=$_SERVER['REQUEST_URI']?>">
<tr>
<td>
<table width="500" border="0" cellspacing="1" cellpadding="0">
<tr>
<td align="center"><strong>Id</strong></td>
<td align="center"><strong>Name</strong></td>
<td align="center"><strong>Lastname</strong></td>
<td align="center"><strong>Email</strong></td>
</tr>
<?php
while($rows=mysql_fetch_array($result)){
//no deberias poner tu ide en un input tambien??
?>
<tr>
<td align="center"><?php $id[]=$rows['id']; ?><?php echo $rows['id']; ?></td>
<td align="center"><input name="name[]" type="text" id="name" value="<?php echo $rows['name']; ?>"></td>
<td align="center"><input name="lastname[]" type="text" id="lastname" value="<?php echo $rows['lastname']; ?>"></td>
<td align="center"><input name="email[]" type="text" id="email" value="<?php echo $rows['email']; ?>"></td>
</tr>
<?php
}
?>
<tr>
<td colspan="4" align="center"><input type="submit" name="Submit" value="Submit"></td>
</tr>
</table>
</td>
</tr>
</form>
</table>
<?php
// Check if button name "Submit" is active, do this
if(isset($_POST['Submit'])){
for($i=0;$i<$count;$i++){
$sql1="UPDATE test_mysql SET name='".$_POST['name'][$i]."', lastname='".$_POST['lastname'][$i]."', email='".$_POST['email'][$i]."' WHERE id='".$_POST['id'][$i]."'";
$result1=mysql_query($sql1) or die(mysql_error().$sql1);
}
}
if($result1){
header("location:update_multiple.php");
}
mysql_close();
?>