PHP Function – Calculating Days In A Month
All developers keep a tool box of useful functions and classes that they pick up or write along the way and this PHP came to me while I was writing an event calendar page for a customer.
I should mention that PHP does offer a cal_days_in_month function for PHP builds of PHP 4.0.7 and higher, but I prefer using the below function because it is guaranteed to work on all PHP version because it is based solely on logic.
The Code
function get_days_in_month($month, $year)
{
return $month == 2 ? ($year % 4 ? 28 : ($year % 100 ? 29 : ($year %400 ? 28 : 29))) : (($month - 1) % 7 % 2 ? 30 : 31);
}
One line of logic provides the number of days in a month, taking into account leap years, and all on one line.
![Camera and Video Control with HTML5]()
Client-side APIs on mobile and desktop devices are quickly providing the same APIs. Of course our mobile devices got access to some of these APIs first, but those APIs are slowly making their way to the desktop. One of those APIs is the getUserMedia API...
![Responsive and Infinitely Scalable JS Animations]()
Back in late 2012 it was not easy to find open source projects using requestAnimationFrame() - this is the hook that allows Javascript code to synchronize with a web browser's native paint loop. Animations using this method can run at 60 fps and deliver fantastic...
![Style Textarea Resizers]()
Modern browsers are nice in that they allow you to style some odd properties. Heck, one of the most popular posts on this blog is HTML5 Placeholder Styling with CSS, a tiny but useful task. Did you know you can also restyle the textarea resizer in WebKit...
![MooTools Gone Wild: Element Flashing]()
If you're like me and lay awake in bed at night, you've flipped on the TV and seen the commercials: misguided, attention-starved college girls fueled by alcohol ruining their futures by flashing lame camera-men on Spring Break. Why do they do it? Attention...
Thanks for your very helpful site! Love the tips.
Hi David,
PHP versions 4&5 also offer the
date("t")function which returns number of days in given month.michael is right:
$totDays = date("t",strtotime($year.'-'.$_month.'-01'));LOL.. Thanks Michael and Paskuale but I think you’re both missing the point! It’s nice to be told that we can get the days directly but the point about this function is that it’s an easily recognisable way to learn how ternary functions in PHP.
Very useful for noobies such as myself – thanks David :)
LOL.. Thanks Michael and Paskuale but I think you’re both missing the point! It’s nice to be told that we can get the days directly but the point about this function is that it’s an easily recognisable way to learn how ternary functions in PHP.
Very useful for noobies such as myself – thanks David :)