php获取日期信息

    public function week()
    {
        echo "今天星期：" . date("w", time());
        echo '<br>';
        echo "上周一日期：" . date('Y-m-d H:i:s', strtotime('-2 monday', strtotime(date('Y-m-d', time()))));
        echo "<br>";
        echo "上个周一零点时间戳：" . strtotime('-2 monday', strtotime(date('Y-m-d', time())));
        echo "<br>";
        echo "本周日日期：" . date('Y-m-d', (mktime(23, 59, 59, date('m'), date('d'), date('Y')) + (7 - (date('w', time()) == 0 ? 7 : date('w', time()))) * 24 * 3600));
        echo "<br>";
        echo "本周日23:59:59时间戳：" . (mktime(23, 59, 59, date('m'), date('d'), date('Y')) + (7 - (date('w', time()) == 0 ? 7 : date('w', time()))) * 24 * 3600);
        echo "<br>";
        echo "上个周日日期：" . date('Y-m-d H:i:s', strtotime('-1 sunday', time()) + 24 * 3600 - 1);
        echo "<br>";
        echo "上个周日时间戳：" . (strtotime('-1 sunday', time()) + 24 * 3600 - 1);
        echo "<br>";
    }