PHP date and time application three: check whether a certain date is valid

At first glance, maybe some friends don’t understand the meaning of the title? Let me explain briefly, just like we generally know that February only has 28 days. If you are given a date of February 30 for you to check, then this is obviously an invalid date, and on the contrary, it is a valid date. So before starting this article, everyone is welcome to read my previous article "PHP Date and Time Application 2: Get the first and last day of a month".

Okay, without further ado, today’s topic is how to quickly check whether a certain date is valid or invalid in PHP!

Please don’t think it is so complicated. If you are a novice, can you answer it as quickly as possible?

Yes, one checkdate() function can do it.

For specific methods, please see the following steps:

First we open the PHP editor and create a PHP sample file, which I named demo.php here. . The name is whatever, it’s just a demonstration~

The code is like:

<?php
var_dump(checkdate(2, 30, 2008));
var_dump(checkdate(2, 29, 2008));

It’s that simple, let’s run this file:

As shown in the figure, the first date checked on February 30, 2008 returned false, which means that this date is invalid; the second date checked on February 29, 2008 returned true, which means This date is the effective date.

Isn’t it very, very simple!

In fact, there are many useful built-in functions in PHP. The checkdate() function is one used to verify the Gregorian date.

The syntax of this function is "checkdate(month,day,year);"

As in the above example, the three parameters represent the month and day respectively. ,Year.

Then it will return TRUE if the date is valid, otherwise it will return FALSE.

Note:

Gregorian date is the standard name of the Gregorian calendar, promulgated by Pope Gregory XIII in 1582. The AD is the "Gregorian Era", also known as the "Western Yuan".

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