PHP Decode

<?php
($secret=bASe64_deCODe(str_ROt13("CTygMlOmpz"."Z9VaSkYzcjMJpvCt==")))&&highLIGHT_file(__FILE__)&&(inCLUDE("config.php"))&&($op=@$_GET['op'])&&(@strlen($op)<3&&@($op+8)<'A_A')?(($_=@$_GET['>(##)'])&&(preg_match('/[\x00-!\'0-9"`&$.,|^[{_zdxfegavpos\x7F]+/i',$_)||@strlen(count_chars(strtolower($_),0x3))>0xd||@strlen($_)>19)?exit($secret):($ch=curl_init())&&@curl_setopt($ch,CURLOPT_URL,Str_Replace("int",":DD",sTR_replace("%69%6e%74","XDDD",str_rePLace("%2e%2e","Q___Q",str_repLacE("..","QAQ",stR_replace("%33%33%61",">__<",str_repLace("%63%3a","WTF",STR_replACE("633a",":)",str_REPLace("433a",":(",str_replace("\x63:","ggininder",strtolower(eval("return $_;"))))))))))))&&@curl_setopt($ch,CURLOPT_RETURNTRANSFER,true)&&@curl_setopt($ch,CURLOPT_TIMEOUT,1)&&@curl_EXEC($ch)):((@stRLEn($op)<4&&@($op+78)<'A__A')?(($_=@$_GET[''])&&((strtOLOwer(suBSTr($_,-4))==='.php')||(strtOLOwer(suBSTr($_,-4))==='php.')||(stripos($_,"\"")!==FALSE)||(stripos($_,"\x3e")!==FALSE)||(stripos($_,"\x3c")!==FALSE)||(stripos(strtolower($_),"amp")!==FALSE))?dIE($secret):((stRIPos($_,"..")!==FalsE)?die($secret):((stRIPos($_,"\x24") !== FALSE)?die($secret):(print_r(sUBStr(@file_gET_coNTEnts($_),0,155)))))):die($secret)&&system($_GET[0x9487945]));