PHP获取某个时间戳是周几。

/**
 * @param int $time
 * @return mixed
 */
function getWeekStr($time = 0) {
    !$time && $time = time();

    $week = date('w', $time);
    $list = ["周日", "周一", "周二", "周三", "周四", "周五", "周六"];

    return $list[$week];
}