How to calculate the week of the year for a specified date in php

In PHP, you can use the date() function to calculate the week of the year for a specified date. You only need to set the first parameter of the function to "W", and then it will Returns a number in ISO-8601 format representing the week of the year; syntax "date('W', timestamp representing the specified time)".

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

In PHP, you can date( ) function to calculate the week of the year for a specified date.

date() function formats the local date and time and returns the formatted date string.

Syntax:

date(format,timestamp);

Returns the week number in the year in ISO-8601 format when format is set to "W", with each week starting on Monday (PHP Newly added in 4.1.0).

timestamp: Specifies the Unix timestamp of the integer, which can be omitted.

Example:

<?php
header("Content-Type: text/plain");
$week = intval(date(&#39;W&#39;,strtotime("2021-01-26")));
echo $week;
?>

Output value:

4

Represents the 4th week of the year

if If the timestamp parameter is omitted, you can calculate the current week of the year.

<?php
header("Content-Type: text/plain");
$week = intval(date(&#39;W&#39;));
echo $week;
?>

Output result:

41

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