How to convert specified date to week in php

Conversion method: 1. Use strtotime() to convert the specified date into a timestamp, the syntax is "strtotime("date")"; 2. Use date() with the formatting character "N" to convert the timestamp As a number representing the day of the week, the syntax "date("N", timestamp)" will return 1 (Monday) to 7 (Sunday).

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

php will specify the date Method of converting to week

In PHP, you can use the date() and strtotime() functions for conversion.

(In fact, date() is mainly used, but the object processed by this function is a timestamp; therefore we need to use the strtotime() function to convert the date to a timestamp first, and then hand it over to date() for processing.)

1. Use the strtotime() function to convert the specified date into a timestamp

strtotime() function can parse the date and time description described in English text into a UNIX timestamp

<?php
header("Content-type:text/html;charset=utf-8");
$str1="2022-05-1";
$str2="2022-05-11";
$time1=strtotime($str1);
$time2=strtotime($str2);
echo "$str1 的时间戳： ".$time1."<br>";
echo "$str2 的时间戳： ".$time2;
?>

2. Convert the obtained timestamp to a Sunday number

date() can format the time and match the formatting characters "N" gets the Sunday number

• N: Returns the day of the week represented by numbers in ISO-8601 format (newly added in PHP 5.1.0), range 1 (indicating Monday) Check your calendar by 7 (meaning Sunday)

echo "$str1 是星期 ".date("N",$time1)."<br>";
echo "$str2 是星期 ".date("N",$time2);

to see if it is correct.

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