php通过判断来源主机头进行防盗链

check.php

<html>

<body>

<form action="test.php" method="post">

    message<input type="text" name="name" value="123456" />

    <input type="submit" value="submit" />

</form>

</body>

</html>

test.php

<?php

header("Content-type:text/html;charset='utf8'");

error_reporting(E_ALL);

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

//print_r($url);

if($url['host'] != "localhost"){

    echo "<script>alert('host error.');history.go(-1);</script>";

    exit(0);

}else{

    echo "<script>alert('host right.');</script>";

    echo "<h1>Hello World!</h1>";

}

php通过判断来源主机头进行防盗链