<?php     if(isset($_SERVER[‘HTTP_REFERER‘])) {        //判断$_SERVER[‘HTTP_REFERER‘]是不是以http://localhost/http 开始        if(strpos($_SERVER[‘HTTP_REFERER‘],"http://localhost/http")==0) {            echo "显示信息";        }else {            //跳转到警告页面            header("Location:warning.php");        }    }else {        header("Location:warning.php");    }?>