我有一个页面显示我的表格的所有内容。除了表格的每一行，我还有一个包含复选框的列。我已经实现了这个来删除行。如果我想在表格中编辑和保存更改，我应该如何处理？下面是我为删除实现的代码。
<?php
// Connect to server and select databse.
mysql_connect("localhost", "root", "")or die("cannot connect");
mysql_select_db("project")or die("cannot select DB");
$sql="SELECT * FROM menu";
$result=mysql_query($sql);
$count=mysql_num_rows($result);
?>
<table width="400" border="0" cellspacing="1" cellpadding="0">
<tr>
<td><form name="form1" method="post" action="">
<table width="400" border="0" cellpadding="3" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<td bgcolor="#FFFFFF"> </td>
<td colspan="4" bgcolor="#FFFFFF"><strong>Delete multiple rows in mysql</strong> </td>
</tr>
<tr>
<td align="center" bgcolor="#FFFFFF">#</td>
<td align="center" bgcolor="#FFFFFF"><strong>Vendor_id</strong></td>
<td align="center" bgcolor="#FFFFFF"><strong>Item_id</strong></td>
<td align="center" bgcolor="#FFFFFF"><strong>Item_name</strong></td>
<td align="center" bgcolor="#FFFFFF"><strong>Price</strong></td>
</tr>
<?php
while($rows=mysql_fetch_array($result)){
?>
<tr>
<td align="center" bgcolor="#FFFFFF"><input name="checkbox[]" type="checkbox" id="checkbox[]" value="<?php echo $rows['item_id']; ?>"></td>
<td bgcolor="#FFFFFF"><?php echo $rows['vendor_id']; ?></td>
<td bgcolor="#FFFFFF"><?php echo $rows['item_id']; ?></td>
<td bgcolor="#FFFFFF"><?php echo $rows['item_name']; ?></td>
<td bgcolor="#FFFFFF"><?php echo $rows['Price']; ?></td>
</tr>
<?php
}
?>
<tr>
<td colspan="5" align="center" bgcolor="#FFFFFF"><input name="delete" type="submit" id="delete" value="Delete"></td>
</tr>
<?php
// Check if delete button active, start this
if(isset($_POST['delete'])){
$checkbox = $_POST['checkbox'];
for($i=0;$i<count($_POST['checkbox']);$i++){
$del_id = $checkbox[$i];
$sql = "DELETE FROM menu WHERE item_id='$del_id'";
$result = mysql_query($sql);}
if($result){echo "<meta http-equiv=\"refresh\" content=\"0;URL=delete_menu.php\">";}}
mysql_close();
?>
</table></form></td></tr></table>