php返回上一页使用session存储上一页地址的方法

//返回上一页变量设置

$HTTP_REFERER = parse_url($_SERVER['HTTP_REFERER']);

if (! isset($_SESSION['ref']) || $HTTP_REFERER['path'] != $_SERVER['REDIRECT_URL']){

$_SESSION['ref'] = array(

'REDIRECT_URL'=>$_SERVER['REDIRECT_URL'],

'HTTP_REFERER'=>"{$_SERVER['HTTP_REFERER']}"

);

}

//html表单返回按钮

<input type="button" value="返回" onclick="location.href='<?=$_SESSION['ref']['HTTP_REFERER']?>'" />