How PHP gets the day of the week

PHP day of the week to get the code:
Date ("l"); // data can be used to obtain the week in English, such as Sunday.
Date ("w"); // you can obtain the number of weeks, for example, 123. Note that 0 is Sunday.

Get Chinese day of the week:
$ Weekarray = array ("day", "one", "two", "three", "four", "five", "Six"); // define an array first
Echo "Week". $ weekarray [date ("w")];

Obtain the specified date:
$ Weekarray = array ("day", "one", "two", "three", "four", "five", "Six ");
Echo "Week". $ weekarray [date ("w", "2011-11-11")];

Because the date function is very powerful, he is fully qualified for all such work. I have attached a table in the manual for convenient reference at any time.
1. a-"am" or "pm"
2. A-"AM" or "PM"
3. d-a few days, two digits. If there are less than two digits, fill in the first zero. For example: "01" to "31"
4. D-the day of the week, with three English letters, for example, "Fri"
5. F-month, full English name; for example: "January"
6. h-12 hours; for example, "01" to "12"
7. H-24 hours; for example: "00" to "23"
8. hours in the g-12 hour format, less than two do not fill in zero; for example: "1" to 12"
9. hours in the G-24 hour system, less than two do not fill in zero; for example: "0" to "23"
10. I-minutes; for example: "00" to "59"
11. j-a few days, two digits. If less than two digits are left blank, for example, "1" to "31"
12. l-the day of the week. Full name in English; for example, "Friday"
13. m-month, two digits. If there are less than two digits, add zero in front, for example, "01" to "12"
14. n-month, two digits. If less than two digits are left blank, for example, "1" to "12"
15. M-month, with three English letters, for example, "Jan"
16. s-second; for example: "00" to "59"
17. S-ending with an English sequence, two English letters, for example, "th", "nd"
18. t-specifies the number of days in a month, for example, "28" to "31"
19. U-total seconds
20. w-number of weeks, for example, "0" (Sunday) to "6" (Saturday)
21. Y-year, four digits, for example, "1999"
22. y-year, two digits, for example, "99"
23. z-the day of the year; for example, "0" to "365"