An example of code to update the shopping cart quantity in PHP

<?php
/**
* php购物车 处理代码
* Edit bbs.it-home.org
*/
require &#39;config.inc.php&#39;; //配置文件
require &#39;checklogin.php&#39;; //登录检测
$username = $_SESSION[&#39;username&#39;];
$action = $_GET[&#39;action&#39;];
switch ($action) {
case "edit_num":
$arr = $arr = $_POST[&#39;suliang&#39;];
foreach($arr as $key=>$value){
$sqlgx = "update `cartemp` set suliang=&#39;$value&#39; where username=&#39;".$username."&#39; and flag=0 and sp_id=&#39;".$key."&#39;";
mysql_query($sqlgx, $conn);
echo "<script>location.href=&#39;shopcat.php&#39;</script>";
}
break;
case "null":
$null_sql = "delete from `cartemp` where username=&#39;$username&#39; and flag=0 ";
mysql_query($null_sql, $conn);
echo "<script>location.href=&#39;shopcat.php&#39;</script>";
break;
case "del":
$id = $_GET[&#39;id&#39;];
$del_sql = "delete from `cartemp` where id=$id";
mysql_query($del_sql, $conn);
echo "<script>location.href=&#39;shopcat.php&#39;</script>";
break;
}
?>