php判断正常访问和外部访问

php判断正常访问和外部访问

<?php
session_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">