一週有:7天:Sunday、Monday、Thusday、Wednesday、Thursday、Friday、Saturday、<br>foreach用法:Sunday,Monday,Thusday,Wednesday,Thursday,Friday,Saturday,<p>Array
(
    [0] => Sunday
    [1] => Monday
    [2] => Thusday
    [3] => Wednesday
    [4] => Thursday
    [5] => Friday
    [6] => Saturday
)