PHP Date and Time Application 9: Get the start and end dates of a certain week in a certain year

Today we will continue to introduce the series of articles on PHP date and time application, so the article "PHP date and time application summary (continuously updated~)" will also be updated in time, and interested friends can collect it. Study~

If you have read this series of articles published before, I believe you are all familiar with date and time.

So for the specific question "How to write a PHP function to get the start and end dates of the week (by week number) in a specific year", can anyone quickly come up with an implementation method?

The following is an implementation method I provided, you can refer to it:

The PHP code is as follows:

<?php

function Start_End_Date_of_a_week($week, $year)
{
    $time = strtotime("1 January $year", time());
    $day = date(&#39;w&#39;, $time);
    $time += ((7*$week)+1-$day)*24*3600;
    $dates[0] = date(&#39;Y-n-j&#39;, $time);
    $time += 6*24*3600;
    $dates[1] = date(&#39;Y-n-j&#39;, $time);
    return $dates;
}

$result = Start_End_Date_of_a_week(12,2020);
echo &#39;本周开始日期: &#39;. $result[0]."<br>";
echo &#39;本周结束日期: &#39;. $result[1];

The output result is ：

The parameters we give here are the year (2020), the number of weeks (12 weeks), and the final calculated date results are 2020-3- 23. 2020-3-29.

strtotime Function: Parses any English text date or time description into a Unix timestamp;

time Function: Returns from the Unix epoch ( The number of seconds since the current time (January 1 1970 00:00:00 GMT);

date function: formats the local date and time and returns the formatted date string;

In this example "date('w', $time);", the parameter w represents the number of the day of the week (0 represents Sunday [Sunday], 6 represents Saturday [Saturday]).

The parameter Y in "date('Y-n-j', $time);" represents the four-digit number of the year; n represents the number of the month without leading zeros (1 to 12 ); j represents the day of the month without leading zeros (1 to 31).

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