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...
![5 HTML5 APIs You Didn’t Know Existed]()
When you say or read "HTML5", you half expect exotic dancers and unicorns to walk into the room to the tune of "I'm Sexy and I Know It." Can you blame us though? We watched the fundamental APIs stagnate for so long that a basic feature...
![Assign Anchor IDs Using MooTools 1.2]()
One of my favorite uses of the MooTools JavaScript library is the SmoothScroll plugin. I use it on my website, my employer's website, and on many customer websites. The best part about the plugin is that it's so easy to implement.
I recently ran...
![Animated Progress Bars Using MooTools: dwProgressBar]()
I love progress bars. It's important that I know roughly what percentage of a task is complete. I've created a highly customizable MooTools progress bar class that animates to the desired percentage.
The Moo-Generated XHTML
This DIV structure is extremely simple and can be controlled...
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 :)