Home arrow PHP arrow Validating User Input with the Strategy Pattern

Validating User Input with the Strategy Pattern

The strategy design pattern is applied much more often than you might think, so if you want to find out how to implement it with PHP 5, this article should guide you through the whole learning process. Welcome to the final installment of the series that began with “Introducing the Strategy Pattern.” In two parts, this series walks you through the key points of how the strategy pattern works, and accompanies its theoretical concepts with copious hands-on examples.

  1. Validating User Input with the Strategy Pattern
  2. Building a validation strategy selector
  3. Building some strategy classes
  4. Validating user-supplied data
  5. Listing all the classes required to implement the strategy pattern
By: Alejandro Gervasio
Rating: starstarstarstarstar / 11
March 06, 2007

print this article




Going back quickly to the topics covered in the first tutorial of the series, certainly you'll remember that I explained the foundations of the strategy design pattern, and complemented the theory with some practical examples of how to apply this handy pattern in PHP 5.

Based upon this scenario, I developed a set of simple PHP classes. One of them was defined as a strategy selector, handy for determining what type of format (HTML or XML) had to be applied to certain file data. The other ones were tasked with implementing a given formatting strategy.

Although the example that I just described may seem rather basic, it shows in a nutshell the logic that drives the strategy pattern: on one hand there's a class that sets the context as to where a predefined group of strategies will be applied, while on the other hand there's one or more classes that implement  these strategies.

However, now that you hopefully digested the contents of the first article of the series, let me tell you what you'll learn in this final tutorial. In the next few lines I'm going to demonstrate how to use the strategy pattern in a useful case, that is validating user-supplied input. Sound like an interesting experience, right?

Now that you know the purpose of this last part of the series, let me show you how to implement the strategy pattern to check a wide range of user inputs. Let's begin now!

>>> 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: