Blog Posts

Getting started writing ZF2 modules

During ZendCon this year, we released 2.0.0beta1 of Zend Framework. The key story in the release is the creation of a new MVC layer, and to sweeten the story, the addition of a modular application architecture.

"Modular? What's that mean?" For ZF2, "modular" means that your application is built of one or more "modules". In a lexicon agreed upon during our IRC meetings, a module is a collection of code and other files that solves a specific atomic problem of the application or website.

As an example, consider a typical corporate website in a technical arena. You might have:

  • A home page
  • Product and other marketing pages
  • Some forums
  • A corporate blog
  • A knowledge base/FAQ area
  • Contact forms

These can be divided into discrete modules:

  • A "pages" modules for the home page, product, and marketing pages
  • A "forum" module
  • A "blog" module
  • An "faq" or "kb" module
  • A "contact" module

Furthermore, if these are developed well and discretely, they can be re-used between different applications!

So, let's dive into ZF2 modules!

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Using the ZF2 EventManager

Earlier this year, I wrote about Aspects, Intercepting Filters, Signal Slots, and Events, in order to compare these similar approaches to handling both asychronous programming as well as handling cross-cutting application concerns in a cohesive way.

I took the research I did for that article, and applied it to what was then a "SignalSlot" implementation within Zend Framework 2, and refactored that work into a new "EventManager" component. This article is intended to get you up and running with it.

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Using DocBlox

Until a few years ago, there were basically two tools you could use to generate API documentation in PHP: phpDocumentor and Doxygen. phpDocumentor was long considered the standard, with Doxygen getting notice when more advanced features such as inheritance diagrams are required. However, phpDocumentor is practically unsupported at this time (though a small group of developers is working on a new version), and Doxygen has never had PHP as its primary concern. As such, a number of new projects are starting to emerge as replacements.

One of these is DocBlox. I am well aware there are several others — and indeed, I've tried several of them. This post is not here to debate the merits or demerits of this or other solutions; the intention is to introduce you to DocBlox so that you can evaluate it yourself.

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Converting DocBook4 to DocBook5

Within the Zend Framework 2 repository, I recently performed a conversion from DocBook 4 to 5. The latter is a more modern version of the toolchain, and offers a somewhat simpler syntax and workflow. For example, you no longer need to track how many levels deep you are in your chapter sections — you simply use a <section> tag. One of the nicer changes is that you do not need to specify a doctype any more; you simply declare XML namespaces on your root elements and continue merrily on your way. This actually allows us to remove some actions in our build process, and makes validation much simpler.

Interestingly, for DocBook5 being available in beta since 2005 and an official standard since 2009, there is very little material on migrating from DocBook 4 to 5.

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Proxies in PHP

A number of programming design patterns look very similar. One of these is the Proxy pattern, which, at first glance, can look like a number of others: Decorator, Flyweight, even plain old object extension. However, it has its own niche, and it can provide some incredible flexibility for a number of programming scenarios.

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Backported ZF2 Autoloaders

In the past six weeks, I've delivered both a webinar and a tutorial on Zend Framework 2 development patterns. The first pattern I've explored is our new suite of autoloaders, which are aimed at both performance and rapid application development — the latter has always been true, as we've followed PEAR standards, but the former has been elusive within the 1.X series.

Interestingly, I've had quite some number of folks ask if they can use the new autoloaders in their Zend Framework 1 development. The short answer is "yes," assuming you're running PHP 5.3 already. If not, however, until today, the answer has been "no."

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Code Generation with Zend\CodeGenerator

Zend Framework has offerred a code generation component since version 1.8, when we started shipping Zend_Tool. Zend_CodeGenerator largely mimics PHP's Reflection API, but does the opposite: it instead generates code.

Why might you want to generate code?

  • You can use it as an assistive form of "copy and paste" for common tasks (as an example, it's used in to generate controller classes and action methods).
  • You might want to generate code from configuration, to remove the "compile" phase of generating objects from configuration values. This is often done to improve performance in situations that rely heavily on configurable values.

Zend\CodeGenerator in the ZF2 repository is largely ported from Zend Framework 1, but also includes some functionality surrounding namespace usage and imports. I used it this week when working on some prototypes, and found it useful enough that I want to share some of what I've learned.

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Dependency Injection: An analogy

I've been working on a proposal for including service locators and dependency injection containers in Zend Framework 2.0, and one issue I've had is trying to explain the basic concept to developers unfamiliar with the concepts — or with pre-conceptions that diverge from the use cases I'm proposing.

In talking with my wife about it a week or two ago, I realized that I needed an analogy she could understand; I was basically using her as my rubber duck. And it turned out to be a great idea, as it gave me some good analogies.

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The Ideas of March

Chris Shiflett has asked the question, why don't people blog anymore? In this age of real-time streams and dead-simple status updates, blogs often feel like the uncared-for step-child or a website; indeed, many folks are trading their blogs for pages that simply track their various lifestreams (tweets, facebook status, flickr images, and more).

While this sort of thing is trendy and interesting, it also sucks:

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Git Subtree Merging Guide

I've been investigating ways to incorporate third-party repositories and libraries into my Git projects. Subversion's svn:externals capabilities are one compelling feature for that particular VCS, and few, if any, other VCS systems, particularly the DVCS systems, have a truly viable equivalent. Git submodules aren't terrible, but they assume you want the entire repository — whereas SVN allows you to cherry-pick subdirectories if desired.

Why might I want to link only a subdirectory? Consider a project with this structure:


On another project, I want to use ComponentB. With svn:externals, this is easy:

library/Foo/ComponentB http://repohost/svn/trunk/library/Foo/ComponentB

and now the directory is added and tracked.

With Git, it's a different story. One solution I've found is using git-subtree, an extension to Git. It takes a bit more effort to setup than svn:externals, but offers the benefits of easily freezing on a specific commit, and squashing all changes into a single commit.

Jon Whitcraft recently had some questions about how to use it, and I answered him via email. Evidently what I gave him worked for him, as he then requested if he could post my guide — which you can find here.

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