<?phpsession_start();if(isset($_POST["check"])&&!empty($_POST["name"])){if($_POST["check"] == $_SESSION["check"]){echo "正常访问";}else{echo "外部访问";}}$token = md5(uniqid(rand(),true));$_SESSION["check"] = $token;?><form method="post" action=""><input type="text" name="name" /><input type="text" name="check" value="<?=$token;?>"><input type="submit">URL:http://www.bianceng.cn/webkf/PHP/201410/45949.htm