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This article mainly introduces the function analysis of PHP cracking anti-hotlink images. It has a certain reference value. Now I share it with you. Friends in need can refer to it.
Only supports jpg and gif. Everyone. It can be modified to support multiple image formats
<?php $url=$_GET['url']; $ext=pathinfo($url,PATHINFO_EXTENSION); if($ext!='jpg' && $ext!='gif'){ // 只支持jpg和gif readfile('/upload/20081209130557536.gif'); exit; } $file=md5($url).'.'.$ext; if(file_exists($file)){ readfile($file); exit; }else{ $data=file_get_contents($url); if(!$data){ // 读取失败 readfile('/upload/20081209130557536.gif'); exit; } $handle=fopen($file,'wb'); fwrite($handle,$data); fclose($handle); echo $data; } ?>
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