In PHP, you can use the date() function to determine the day of the week based on the timestamp. This function can format the timestamp into a readable date and time string; the syntax format is "date("w ",timestamp);", "w" specifies that the timestamp be formatted as a number representing the day of the week, 0 represents Sunday, 6 represents Saturday.
The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer
In PHP, you can date( ) function to determine the day of the week based on the timestamp.
date() function formats the local date and time and returns the formatted date string.
Syntax:
date(format,timestamp);
When format is set to "w", you can specify that the timestamp is formatted as a number representing the day of the week, (0 represents Sunday [Sunday], 6 represents Saturday [Saturday] ]).
<?php header("Content-type:text/html;charset=utf-8"); $time=strtotime("2021-09-25"); $week = date("w",$time); echo $week; ?>
Output:
6
Let’s optimize the code:
<?php header("Content-type:text/html;charset=utf-8"); $weekarray = array("日","一", "二", "三", "四", "五", "六"); $time=strtotime("2021-09-26"); $week = $weekarray[date("w",$time)]; echo "周".$week."<br>"; $time=strtotime("2021-09-25"); $week = $weekarray[date("w",$time)]; echo "周".$week; ?>
Output:
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