News Feed
Sections




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

James Fuller's Blog:
Enforcing contracts in your PHP functions and methods
March 23, 2012 @ 08:37:11

James Fuller has a new post to his blog today about a way you can enforce contracts in your PHP using a combination of type hinting and value checking.

Design by contract is an important concept for controlling what type of input your methods or functions can receive. One of the most dangerous features of PHP is that functions will still execute even when they are missing required arguments, by emitting a warning instead of an error. In this post, I am going to walk through some of the solutions available to deal with this problem.

He shows how to alter a basic function to first use type hinting to catch when a variable is the wrong type (in this case checking for an array and stdClass) which causes a Fatal error and makes the function not execute. He includes sample code for the type/value checking option and also includes a suggestion of using PHPUnit's assertions as another option.

Finally, he introduces the ContractLib tool (from Stuart Herbert) that makes use of closures to enforce checks - his example checks to see if something is a string and that it's not empty.

0 comments voice your opinion now!
enforce contract function exception typehint contractlib


blog comments powered by Disqus

Similar Posts

Job Posting: Sarma Creative Seeks PHP Developer (Contract)

Rob Allen's Blog: SqlSrv v2 and long field names

Hiveminds Magazine: Using numbers in PHP function names

DevShed: Handling MySQL Data Set Failures in PHP 5

Stefan Mischook's Blog: Creating Your Own Functions - Part 2


Community Events





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


community list opinion api release deployment introduction package interview tips update language series framework laravel podcast install symfony library zendserver

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