來(lái)自《PHP核心技術(shù)與最佳實(shí)戰(zhàn)》

    
    <?php

    define('SECRET', '67%$#ap28');

    function m_token()
    {
        $str = mt_rand(1000, 9999);

        $tim = $_SERVER['REQUEST_TIME'] - $str;

        // 十進(jìn)制轉(zhuǎn)換為十六進(jìn)制
        $str2 = dechex($tim);

        $sub_str = substr(md5($str . SECRET), 0, 10);

        $result = $str . $sub_str  . $str2;

        return $result;
    }

    $token = m_token();

    function v_token($str, $delay = 1)
    {
        $rs = substr($str, 0, 4);

        $middle = substr($str, 0, 14);

        $rs2 = substr($str, 14, 8);

        // $resu = ($middle == $rs . substr(md5($rs . SECRET), 0, 10)) && ($_SERVER['REQUEST_TIME'] - hexdec($rs2) - $rs < $delay);

        $resu = ($middle == $rs . substr(md5($rs . SECRET), 0, 10));

        return $resu;
    }