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Acim.net:
Trait injection in Zend Framework 2
December 11, 2014 @ 11:55:56

Boban Acimovic has recently posted a tutorial showing you how to use traits in a Zend Framework 2 application to inject additional functionality into your pre-existing classes.

There are several tutorials on the Internet which explain how to use interface based dependency injection in Zend Framework 2. The idea is to make an initializer, figure out which interfaces a class implements and then inject appropriate dependencies using setters defined in the interfaces. Bad part about this is that in each class you implement such an interface you have to declare a property which would hold the injected object and also to implement the setter for it, which is defined in the interface, by the way. In order to simplify this further it is possible to write trait for each interface, but then why should not use just traits? Why do we need interfaces? Is this possible at all?

He includes some example code showing how to set up dependency injection for the traits (via a custom injector based on the "InitializerInterface") and make the autoloading easier. He shows how to add this to the provider configuration as an "initializer" and create the first example trait, a checker for data in user passwords. He then drops the functionality into a service class just by using the "use" keyword and the trait name.

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Link: http://www.acim.net/2014/11/trait-injection-in-zend-framework-2/

Rob Allen:
Validating JSON with ZF2's ZendValidator
December 09, 2014 @ 10:42:40

Rob Allen has a quick post today showing how to use the ZendValidator component from Zend Framework 2 to handle JSON validation.

Let's say that you have an admin form where the user can enter JSON and you'd like to validate that the JSON parses before allowing the user to submit. To do this, you can use the rather excellent jsonlint project by Jordi Boggiano. Obviously, add it via Compser.

He starts with a quick example of using the "JsonParser" in isolation to validate a JSON string. Then he integrates it into the framework as a custom validator class (extending the AbstractValidator) and enabling the "isValid" call to be made and return a pass/fail result. You can find out more about the ZendValidator component in this page of the Zend Framework manual.

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Link: http://akrabat.com/zend-framework-2/validating-json-with-zf2s-zendvalidator/

Rob Allen:
Sending attachments in multipart emails with ZendMail
September 16, 2014 @ 09:18:09

Rob Allen has a new post today showing you how to use the ZendMail component of the Zend Framework 2 to send attachments with multipart emails. A multipart email allows you to combine both the HTML and plain text versions of the content into a single email.

I've written before about how to send an HTML email with a text alternative in ZendMail, but recently needed to send an attachment with my multipart email. With help from various sources on the Internet, this is how to do it.

He includes the full code for the example first: a "sendEmail" function that sets up the MIME and plain-text parts and uses the "MimeMessage" and "MimePart" objects to attach the file. He goes through each of the parts of the script and describes what's happening and how that changes the content of the email. You can find out more about the ZendMail component in this section on the Zend Framework manual.

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Link: http://akrabat.com/zend-framework-2/sending-attachments-in-multipart-emails-with-zendmail/

Rob Allen:
Integrating ZF2 forms into Slim
August 26, 2014 @ 09:40:47

Rob Allen has a helpful post if you've ever wanted to take advantage of the simplicity of the Slim framework and the power of the Zend Framework 2 forms. In this latest post he walks you through the process of setting it all up and using the ZF2 elements outside of the main framework.

Let's say that you want to use Zend Framework 2′s Form component outside of ZF2 itself. In this case, a Slim application. It turns out that Composer makes this quite easy, though there's quite a lot of code involved, so this is a long article. Start with a really simple Slim Application...

His simple Slim application - just one route - handles both the GET and POST actions and uses several ZF2 components besides just the Form (dependencies mostly). He shows you the updates and additions you'll need to make to the service manager configuration and how to set up some custom validation and the form object in the controller. His example form only has two elements, an email field and a submit button and validation is done on the email address when it's submitted. Finally he includes the View object, extended from Slim's that combines some of the ZF2 and Slim handling to correctly render the form.

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Link: http://akrabat.com/zend-framework-2/integrating-zf2-forms-into-slim/

Rob Allen:
Globally overriding validation messages for ZF2 forms
August 19, 2014 @ 10:46:27

Rob Allen has posted a quick hint about overriding validation messages in a Zend Framework v2 based application. This override is related to the output of a standard form and works globally instead of just on a single form.

One thing that I always do when creating a Zend Framework 2 form is override the validation messages for a number of validators - EmailAddress in particular. I recently decided that I should probably sort this one out once and be done with it. Turns out that it's quite easy assuming that you use the FormElementManger to instantiate your forms.

The post includes all the code you'll need to do the override: a custom validator example, the changes you'll need to make to the configuration and an example of a form that uses the custom handling. He explains each of the parts too, showing how they fit together in your module.

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zendframework2 override validation message form tutorial

Link: http://akrabat.com/zend-framework-2/globally-overriding-validation-messages-for-zf2-forms/

Master Zend Framework:
Easy Cache Configuration With StorageCacheAbstractServiceFactory
August 07, 2014 @ 14:46:54

The Master Zend Framework site has posted a tutorial centered around caching in Zend Framework 2 applications. In this new post Matthew Setter looks at using the StorageCacheAbstractServiceFactory to handle the configuration and management of caching. The method is already implemented in the skeleton ZF2 application, so it makes it even easier to get started.

If you've been playing with Zend Framework 2 for some time, specifically the ZF2 Skeleton Application, you still may not have come across some of the pre-registered service manager abstract factory options. As I was browsing through the Application module's module.config.php recently, I came across this snippet [setting up the StorageCacheAbstractServiceFactory]. It was at that point I wondered why I'd spent time setting up caching using other methods, when this approach was already there and seemed to do a lot of the heavy lifting for me. So in this week's tutorial, I'm going to take you through how to use it, working with the default configuration provided in the manual.

He shows how to update the default configuration for the caching service including the caching type (the technology) and the configuration options to use. He mentions the kinds of caching available and provides a more "real world" example. This example uses the Laravel Homestead VM and a simple Redis server as the caching datastore. He sets up the configuration and shows how to access the caching service in both the controller and via dependency injection. He finishes off with a few lines of code showing how to use the caching to check for an item and, if not found, add it to the dataset.

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zendframework2 tutorial cache configuration storagecacheabstractfactory

Link: http://www.masterzendframework.com/servicemanager/storage-cache-abstract-service-factory-easy-cache-configuration

Master Zend Framework:
Accessing ServiceManager Services in Controller Plugins
July 31, 2014 @ 09:43:49

Matthew Setter has posted another new tutorial to his Master Zend Framework site today showing you how to access ServiceManager services in controller plugins. Controller plugins are a Zend Framework feature that allows certain events to trigger the plugin code during the lifetime of the controller.

I've seen some questions on Google+ and StackOverflow of late, regarding how to get access to the Zend Framework 2 database adapter, along with other ServiceManager-defined services, in a custom controller plugin. This type of setup can come in handy for a number of situations. You may want to access services such as caching, logging or databases and want to provide a simple interface for doing so. People seem really interested in how to do it, but how to get access to services from the ServiceManager doesn't seem to be as clear as it could be. Gladly, there's not much involved in actually doing it.

He shows you how to create a plugin for an existing module, creating the two needed classes and adding a new function to configure it. He starts with the plugin factory that can be used to generate an instance of the plugin. Next is the plugin class itself that extends the abstract plugin and controller plugin classes. The required database adapter is injected into it via a constructor injection. Finally, in the Module.php configuration, he creates a "getControllerPluginConfig" method that registers the new plugin and points to its class. A screencast is also provided showing the active development of the code.

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Link: http://www.masterzendframework.com/servicemanager/accessing-servicemanager-services-controller-plugins

Master Zend Framework:
How to view an Instagram Photo Stream in Zend Framework 2
July 09, 2014 @ 10:53:59

On the Master Zend Framework site Matthew Setter has a new tutorial showing how to pull in Instagram photo feeds in a Zend Framework 2 application via their on developer functionality.

In today's tutorial, we're going to learn how to retrieve and display an Instagram photo stream in Zend Framework 2. We're going to cover the essentials of adding the libraries we'll need to composer.json, handling authentication and then retrieving and displaying our photo stream in a controller action. We'll be doing all of this by using composer to create a new Zend Framework 2 project, based on the ZF2 Skeleton App project and then add a new controller and action which will handle the work involved.

The tutorial uses a basic skeleton application and a PHP Instagram library to make the connection to their API. He shows you how to register your application with Instagram and set up the OAuth configuration to handle the authorization process. He walks you through the creation of the controller, setup of session support and the creation of a "photosAction" to view the results of the photo feed pull. He includes a screenshot of what the end result should look like with it all up and working.

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Link: http://www.masterzendframework.com/api/view-instagram-photo-stream

Master Zend Framework:
Change Layout in Controllers and Actions in Zend Framework 2
June 27, 2014 @ 10:07:20

Matthew Setter has a new post to his Master Zend Framework site today showing you how to change layouts in controllers and actions for a Zend Framework v2 based application.

In Zend Framework 2, if you want to change the layout just for one action or for every action in a controller, how do you do it? How do you do it without overriding the layout for every action throughout the entire application? In today's post, based on an excerpt from Zend Framework 2 for Beginners, we see how to achieve both of these requirements.

He talks about the framework's use of the two-step view pattern and what the "template_map" definition usually looks like in a default ZF2 application. He shows three different ways to do the view switching from the controller or action:

  • Override the default layout in your module
  • Override the layout per/action
  • Override the layout per/controller

Each of these comes with a bit of code showing you how to make it work. They move from simplest to more complex, with the layout per controller being the most complex. It's not that it's difficult, it's just that there's more involved to make it work. You can either do it at the controller level or at the module level.

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Link: http://www.masterzendframework.com/views/change-layout-controllers-actions-zend-framework-2

Master Zend Framework:
Using the ClassMap Autoloader for Better Performance
June 19, 2014 @ 11:18:29

Matthew Setter has a new post to his Master Zend Framework site today with a recommendation on how you can use a classmap in your autoloader to reduce the time it takes "searching" for the files it needs.

Zend Framework 2′s been critiqued many times as being slow, at least slower than some of the other leading PHP frameworks. And to be fair, sometimes it's true. But it doesn't need to be and there are simple things you can do to improve performance of your applications. So this post will be the first in a multi-part series looking at ways in which you can improve the performance of your Zend Framework 2 application, with only a minimum of effort. Today, we're looking at the 2 autoloaders which are available in Zend Framework 2; these being the StandardAutoloader and ClassMapAutoloader.

He briefly introduces the concept of autoloaders and the PSR-0 standard that helped to bring a more unified method for their handling. He then gets into examples of using each of the two autoloader types. The Standard version (a fallback if nothing else is set up) resolves things based on a file path and locating classes in the right namespaces. The ClassMap autoloader does this mapping ahead of time and matches a path to a namespace+class. He includes code snippets showing how to set each of them up and a few statistics (using Apache's ab tool) of the difference in performance.

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zendframework2 tutorial autoloader classmap standard performance

Link: http://www.masterzendframework.com/performance-2/classmap-autoloader


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