获取是否指定地址进来
/************
** 获取是否指定地址进来
** 参数值为判断必须进来的来路 第二个值可以为空 为空进跳到第一个值的地址
** 返回值:无
*************/
如:登录页面login.html 要发送到login.php
首先有时候要判断有没有表单值进来 然后再进行下一步
这个代码也可以用来判断表单有没有传值进来
而且还可以做更多的防御攻击
/************ **获取是否指定地址进来 **参数值为判断必须进来的来路第二个值可以为空 为空进跳到第一个值的地址 **返回值:无 *************/ function Antecedents($url,$toUrl='1'){ if($toUrl==1){ $toUrl=$url; } $url=ltrim($url,"/"); $goUrl=$_SERVER['HTTP_REFERER']; if($goUrl!=$url){ header("location:$toUrl"); } }
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