Home arrow PHP arrow Enforcing Object Types in PHP: Using the Type Hinting Feature in PHP 5

Enforcing Object Types in PHP: Using the Type Hinting Feature in PHP 5

Here we are again. Welcome to the last tutorial of the series “Enforcing object types in PHP.” As this article’s title suggests, this series introduces the basics of object type enforcement in PHP, covering some of the most common methods for checking types of objects in both PHP 4 and PHP 5 respectively.

  1. Enforcing Object Types in PHP: Using the Type Hinting Feature in PHP 5
  2. The “Type Hinting” feature of PHP 5: taking an in-depth look
  3. A practical example: using “Type Hinting” within a web page generator class
  4. Putting “Type Hinting” to work: building object-based web documents
By: Alejandro Gervasio
Rating: starstarstarstarstar / 3
March 01, 2006

print this article




As you’ll hopefully recall, in the previous article I explained the key points of using the “instanceof” operator available in PHP 5, in order to check the type of objects that eventually could be passed as input arguments to other PHP classes across the same Web application.

True to form, this operator is very useful in cases where filtering objects is a must, and of course when the flow of an application must be moved to different code blocks, in accordance with the type of object aggregated to a particular class. Additionally, you can use the “instanceof” operator for checking whether certain objects are implementers of a specific interface too. As you can see, possibilities for utilizing this operator in PHP 5 applications are certainly numerous.

Now, returning to the subject of this last tutorial, I’ll introduce another method for enforcing object types in PHP 5: the “Type Hinting” feature. It can also be used in conjunction with the “instanceof” operator that you learned about before, in order to develop PHP applications that implement thorough routines for filtering unwanted objects. Generally speaking, when you finish reading this article, you should be armed with a few more methods for forcing object types in PHP, in this way expanding your overall knowledge of object-oriented programming. 

With the formalities out of the way, let’s get started.

>>> More PHP Articles          >>> More By Alejandro Gervasio

blog comments powered by Disqus
escort Bursa Bursa escort Antalya eskort


- Hackers Compromise PHP Sites to Launch Attac...
- Red Hat, Zend Form OpenShift PaaS Alliance
- PHP IDE News
- BCD, Zend Extend PHP Partnership
- PHP FAQ Highlight
- PHP Creator Didn't Set Out to Create a Langu...
- PHP Trends Revealed in Zend Study
- PHP: Best Methods for Running Scheduled Jobs
- PHP Array Functions: array_change_key_case
- PHP array_combine Function
- PHP array_chunk Function
- PHP Closures as View Helpers: Lazy-Loading F...
- Using PHP Closures as View Helpers
- PHP File and Operating System Program Execut...
- PHP: Effects of Wrapping Code in Class Const...

Developer Shed Affiliates


Dev Shed Tutorial Topics: