PHP更新购物车数量(表单部分/PHP处理部分)

　　<form action="?action=edit_num" method="post" name="car<?php $c_rs['id'];?>" id="car<?php $c_rs['id'];?>">

　　<input name="suliang[<?php echo $c_rs['sp_id'];?>]" type="text" id="suliang[<?php echo $c_rs['sp_id'];?>]" value="<?php echo $c_rs['suliang'];?>"/>

　　<input type="submit" name="button" id="button" value="更新购物车" />

　　</form>

　　<?php

　　require 'config.inc.php';

　　require 'checklogin.php';

　　$username = $_SESSION['username'];

　　$action = $_GET['action'];

　　switch ($action) {

　　case "edit_num":

　　$arr = $arr = $_POST['suliang'];

　　foreach($arr as $key=>$value){

　　$sqlgx = "update `cartemp` set suliang='$value' where username='".$username."' and flag=0 and sp_id='".$key."'";

　　mysql_query($sqlgx, $conn);

　　echo "<script>location.href='shopcat.php'</script>";

　　}

　　break;

　　case "null":

　　$null_sql = "delete from `cartemp` where username='$username' and flag=0 ";

　　mysql_query($null_sql, $conn);

　　echo "<script>location.href='shopcat.php'</script>";

　　break;

　　case "del":

　　$id = $_GET['id'];

　　$del_sql = "delete from `cartemp` where id=$id";

　　mysql_query($del_sql, $conn);

　　echo "<script>location.href='shopcat.php'</script>";

　　break;

　　}

　　?>