PHP에서 이미지 핫링크 보호를 우회하는 방법

<script>window.sc="<img src='http://cdn.jbxue.com//uploads/2011/06/1309476244-elicium-rai-01-528x351.jpg?" Math.random() "'>";</script>
<iframe id="imiframe" src="javascript:parent.sc" style="border:none; overflow: hidden;" scrolling="no" frameborder="0" onload="javascript:var x=document.getElementById('imiframe').contentWindow.document.images[0];this.width=x.width 10;this.height=x.height 10;"></iframe>

2、curl的方法 用法：

http://your-domain-name/showpic.php?url=image_url

3、PHP header发送各种类型文件下载 文件名：showpic.php

<?php
    $url = $_GET["url"];
    //$url = str_replace("http:/","http://",$url);
    $dir = pathinfo($url);
    $host = $dir['dirname'];
    $refer = $host.'/';

    $ch = curl_init($url);
    curl_setopt ($ch, CURLOPT_REFERER, $refer);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);//激活可修改页面,Activation can modify the page
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
    $data = curl_exec($ch);
    curl_close($ch);

    $ext = strtolower(substr(strrchr($img,'.'),1,10));
    $types = array(
                'gif'=>'image/gif',
                'jpeg'=>'image/jpeg',
                'jpg'=>'image/jpeg',
                'jpe'=>'image/jpeg',
                'png'=>'image/png',
    );
    $type = $types[$ext] ? $types[$ext] : 'image/jpeg';
    header("Content-type: ".$type);
    echo $data;
?>

遇到PHP 提示错误Cannot modify header information headers already sent ，原因在于：这些代码之前不要有任何内容输出的，包括空白，切记！

有了以上的代码，就可以这样显示图片了：

<img src="http://your-domain-name/showpic.php?url=http://cdn.jbxue.com//uploads/2011/06/1309476244-elicium-rai-01-528x351.jpg" />

真是道高一尺，魔高一丈啊，php图片防盗链就这样没有守住防线，哈哈。