How to get the current week in php

php method to get the week: first create a PHP sample code file; then define a "getWeeks" method; then get the first day through the date function; finally get the first day of the week through strtotime and other functions Just a few.

Recommended: "PHP Tutorial"

PHP Gets the current date in the year Week

 /**
     * 获取当前日期是一年中的第几周
     * @param string $date
     * @return float
     */
    public static function getWeeks($date = '') {
        /**
         * 2007年 第一周 是 01-01 到 01 - 07 因为第一天就是星期一 6
         * 2008年 第一周 是 01-01 到 01 - 06 因为第一天就是星期二 5 (闰年多一天)
         * 2009年 第一周 是 01-01 到 01 - 04 因为第一天就是星期四 3
         * 2010年 第一周 是 01-01 到 01 - 03 因为第一天就是星期五 2
         * 2011年 第一周 是 01-01 到 01 - 02 因为第一天就是星期六 1
         * 2012年 第一周 是 01-01 到 01 - 01 因为第一天就是星期天 0
         */
 
        $now_date = $date !== '' ? $date : date('Y-m-d');
 
        // 获取第一天
        $first_date = date('Y',strtotime($now_date)).'-01-01';
        // 获取第一天是周几
        $week_num = array(7, 1, 2, 3, 4, 5, 6);
        $first_date_week = $week_num[date('w',strtotime($first_date))];
 
        $diff_times = strtotime($now_date) - strtotime($first_date);
        $diff_days = MathUtil::div($diff_times , 86400,0) + 1;
        return ceil(($diff_days + $first_date_week - 1) / 7);
}

1 //[PHP] Function to calculate the current teaching week

2 //function current_week ($date_of_firstday)

3 //Function: Return but the previous week

4 //Parameter: $date_of_firstday The default value is 2006-9-1

5 //Parameter format: String 2006-9 -1 Do not appear 01, 02, 03, 04

6 //If school starts on Thursday, September 1, 2006, for ease of calculation, the date of Monday of the week when school starts will be counted as the start date.

7 ​

8 ​ function current_week ($date_of_firstday='2006-8-28'){

9 ​ //The timestamp of the first day of school

10 $year = substr($date_of_firstday,0,4);

##11 $month = substr($date_of_firstday,5,1);

12 $day = substr($date_of_firstday, 7,2);

13 $time_chuo_of_first_day = mktime(0,0,0,$month,$day,$year);

14 //Today’s timestamp

15 $month = date('n'); //Get month n

16 $day = date('d'); //Get day d

17 $year = date('Y'); //Get the year Y

18 $time_chuo_of_current_day = mktime(0,0,0,$month,$day,$year);

19 $cha = ($time_chuo_of_current_day-$time_chuo_of_first_day)/60/60/24;

20 $zhou = (int)(($cha)/7 1);

21 return $zhou;

twenty two }

The above is the detailed content of How to get the current week in php. For more information, please follow other related articles on the PHP Chinese website!