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.
![Convert XML to JSON with JavaScript]()
If you follow me on Twitter, you know that I've been working on a super top secret mobile application using Appcelerator Titanium. The experience has been great: using JavaScript to create easy to write, easy to test, native mobile apps has been fun. My...
![Creating Scrolling Parallax Effects with CSS]()
Introduction
For quite a long time now websites with the so called "parallax" effect have been really popular.
In case you have not heard of this effect, it basically includes different layers of images that are moving in different directions or with different speed. This leads to a...
![WordPress-Style Comment Controls Using MooTools or jQuery]()
WordPress has a nice little effect on the Admin Dashboard where it shows and hides the comment control links when you mouseover and mouseout of the record's container. Here's how to achieve that effect using MooTools or jQuery.
The XHTML
Notice that we place the links into...
![CSS Background Animations]()
Background animations are an awesome touch when used correctly. In the past, I used MooTools to animate a background position. Luckily these days CSS animations are widely supported enough to rely on them to take over JavaScript-based animation tasks. The following simple CSS snippet animates...
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 :)