How to get the current week of the year in php

In PHP, you can use the date() function with the "W" character to get the week of the year for the current date. The syntax "date('W')" will return a number representing the year. The number of the week.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In PHP, you can use date () function to get the week number of the year for the current date.

date() function can format a local time or date. The syntax of this function is as follows:

date($format [,$timestamp])

The parameter description is as follows:

• $format: Indicates the formatted time format, which can contain some characters with special meanings.

• $timestamp: Indicates the timestamp to be formatted. It is an optional parameter and defaults to the current time (when $timestamp is omitted). It can also be understood that the default value of $timestamp is time().

When the $formatc parameter value of the date() function is set to "W", and the $timestamp parameter is omitted or is time(), the year of the current date can be obtained of weeks.

• W: Will use numbers to represent the week of the year according to the ISO-8601 standard format, and each week starts on Monday, (PHP New in 4.1.0). For example: 42 (the 42nd week of the year).

Example:

<?php
header("Content-Type: text/html;charset=utf-8");  //可不要，在这里只是为了让确定字符格式，防止乱码。
$week = date(&#39;W&#39;);
echo &#39;今天是一年中的第&#39;.$week.&#39;周&#39;;
?>

Let’s see if it is:

I counted on the calendar and it was indeed the 8th week.

Extended knowledge: Parameter $format Special characters that can be recognized in the format string

##MThe English abbreviation of the month Jan to DecnUse numbers to represent the current month 1 to 12tSpecify the number of days in the month28 to 31LWhether the specified year is a leap yearIf it is a leap year, the value is 1, otherwise it is 0oUse numbers to represent the year according to the ISO-8601 standard format, which is the same as Y. Same (new in PHP 5.1.0) 1999 or 2019YUse 4 digits to represent the complete yearFor example: 1999 or 2019yUse 2 digits to represent the yearFor example: 99 or 03aLowercase AM and PM valuesam or pm##AB gGhHisueI (capital "i")OPTZcrU Recommended learning: "

format character	Description	Return value example
d	Month Use two digits to represent the day of the week. If there are less than two digits, add 0	01 to 31
D	to indicate the day of the week. English abbreviation (using 3 letters)	Mon to Sun
l (lower case letter of "L")	English words for the days of the week	Sunday to Saturday
N	According to the ISO-8601 standard format, use numbers to represent the days of the week (newly added in PHP5.1.0 )	1 (meaning Monday) to 7 (meaning Sunday)
S	The English suffix after the day of the month (use 2 characters means)	st, nd, rd or th. Can be used with j
w	Use numbers to represent the day of the week	0 (for Sunday) to 6 (for Saturday)
z	Use numbers to represent the days of the year	0 to 365
W	According to the ISO-8601 standard format, use numbers to represent the week of the year, each week starts on Monday, (new in PHP 4.1.0)	For example: 42 (current year The 42nd week)
F	English words for the month, such as January or June	January to December
m	Use two digits to represent the current month	01 to 12
Uppercase AM and PM values	AM or PM
Swatch Internet Standard Time	000 to 999
Use 12-hour format to represent hours	1 to 12
Use 24-hour format to represent hours	0 to 23
Represent hours using 12-hour format, with leading zeros	01 to 12
Represent hours using 24-hour format, with leading zeros	00 to 23
Use two digits to represent minutes, with leading zeros	00 to 59>
Use two digits to represent seconds , with leading zeros	00 to 59>
milliseconds (new in PHP 5.2.2). It should be noted that the date() function always returns 000000, because it only accepts integer parameters, and DateTime::format() only supports milliseconds	For example: 654321
Time zone identifier	For example: UTC, GMT, Atlantic/Azores
Whether it is daylight saving time	Daylight saving time is 1, otherwise it is 0
The number of hours difference from Greenwich Time	For example: 0200
The difference from Greenwich Mean Time (GMT), hours and minutes are separated by colons	For example: 02:00
The time zone where this machine is located	For example: EST, MDT (complete text format under windows, such as "Eastern Standard Time" , the Chinese version will display "China Standard Time")
The number of seconds of the time difference offset, the time zone offset west of UTC is always negative, Time zone offsets east of UTC are always positive	-43200 to 43200
Dates in ISO-8601 format	2014-02-12T15:19:21 00:00
Date in RFC 822 format	For example: Thu,21 Dec 2000 16:01:07 0200
The number of seconds since the UNIX epoch (January 1 1970 00:00:00 GMT)	Returns the same timestamp as time()

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