News Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

Brian Moon's Blog:
Null vs. isset()
January 29, 2009 @ 09:34:59

In this new post to his blog, Brian Moon compares two things that, on the outside, might seem a lot alike but do have their differences under the hood - a null value and the isset function.

I am working with a newcomer to PHP and he asked me about setting a variable to null and how to check that. He had found some example or information that showed that setting a varaible equal to null would unset the variable. So, he was unclear if he could then reliably check if the variable was equal to null. Having avoided null like the plague in my years of PHP, I was not sure. So, I mocked up a quick script to see what the states of a variable are in relation to null.

His test verified that a variable, set equal to null will be found to be equal to null, will be set (isset) and will be found empty by PHP's empty

0 comments voice your opinion now!
null value variable compare isset empty


blog comments powered by Disqus

Similar Posts

Jonathan Snook's Blog: CakePHP, is it worth it?

Mike Bernat's Blog: CakePHP - Changing the Default Value of a Date-Time Input

Ben Ramsey's Blog: Undefined Constant Is a String?

Johannes Schluter's Blog: References and foreach

Andy Jeffries' Blog: Rebuilding a site from Symfony to Rails


Community Events





Don't see your event here?
Let us know!


laravel language refactor release interview configure unittest developer testing list opinion podcast install series threedevsandamaybe community code introduction framework symfony2

All content copyright, 2014 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework