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True Dependency Injection with Symfony Components
Jan 20, 2016 @ 10:37:39

On the Toptal.com blog there's a recent post about true dependency injection with Symfony between components in your application and only using the dependency injection container for its intended purpose.

Symfony2, a high performance PHP framework, uses Dependency Injection Container pattern where components provide a dependency injection interface for the DI-container. This allows each component to not care about other dependencies. [...] But this means DI-container can be used as a Service Locator.

[...] In this article we will try to build a Symfony2 application without implementing Service Locator pattern. We will follow one simple rule: only DI-container builder can know about DI-container.

They start off by talking about the structure of the dependency injection container and how it relates to the three main types: controller, method and property injections. He then starts in on creating the sample project and requiring only the Symfony DI, configuration and Yaml components. He then creates a ContainerBuilder class and sets up the HttpKernel functionality to pull the response from the container. He then makes a simple controller with a default action that just responds with text. With this working he updates it to pull in an input variable. He then makes updates to the application with changes to the route handing, templating (Twig), Doctrine (database) and tag handling.

tagged: dependency injection di symfony component framework router yaml container tutorial httpkernel

Link: http://www.toptal.com/symfony/true-dependency-injection-symfony-components

JetBrains Blog:
Docker Support in PhpStorm
Nov 03, 2015 @ 10:08:35

In this recent post to the JetBrains blog they show how to set up and configure the Docker support the latest version includes built in to the IDE.

Docker is an open platform for building, shipping and running distributed applications. It gives programmers, development teams and operations engineers the common toolbox they need to take advantage of the distributed and networked nature of modern applications.

With the new Docker integration plugin for PhpStorm, you can add Docker support to existing projects, view logs, manage Docker containers, and debug PHP web applications from right inside PhpStorm.

They help you get the integration plugin installed and show you where the machine should be located and how to set it up under PHPStorm's deployment options. Next up they include the steps for getting the Docker machine up and running (again, inside the IDE) and managing the containers related to the machine.

tagged: docker support phpstorm ide jetbrains container machine

Link: http://blog.jetbrains.com/phpstorm/2015/10/docker-support-in-phpstorm/

SitePoint PHP Blog:
Docker and Dockerfiles Made Easy!
Oct 16, 2015 @ 15:56:58

The SitePoint PHP blog has a post that aims to help you with Docker and introduces some of the basic concepts and steps to understand the Dockerfile configuration.

It’s become second nature for developers to use Virtual Machines to configure and manage their working environments. Most professionals who use VMs use Vagrant for dealing with their development environments. In this article, we’ll be moving from Vagrant to Docker, and use a small Laravel application to test that everything is working as expected.

They walk you through the installation of necessary tools, creation of a simple Docker machine and the concepts behind images and containers. They show you how to create a simple Ubuntu-based machine and configuring it to serve up the default Ubuntu+Apache page. They also cover container volumes, a method for keeping a local folder in sync with one in your instance. They help you set this up with a Laravel installation. Next up they help you configure the database container running MySQL and connect it to the Laravel instance. The tutorial also shows how to set up links between the containers, gets into some of the details of the Dockerfile structure and using "docker compose" to easily create environments based off a YAML configuration.

tagged: docker dockerfiles tutorial environment container image laravel

Link: http://www.sitepoint.com/docker-and-dockerfiles-made-easy/

Shameer C:
Slim 3: Replacing Pimple with Aura.Di
Sep 28, 2015 @ 12:12:25

In a post to his site today Shameer C shows you how to replace Pimple in Slim 3 as an application's dependency injection container. He replaces it with the Aura.Di container, a relatively easy replacement thanks to the container interoperability efforts.

Slim framework is my go-to micro framework for all small projects because of it's simplicity and easiness to use. The new version of this cool framework is just around the corner and they have released RC-1 a few days back. [...] Slim 3 has a default DI Container that extends Pimple. [...] Though Slim uses Pimple by default, we can replace it with any DI container that implements Container Interoperability interface, which is a really great feature. The only caveat is Slim sets some of it's required services from the default container. So we should do it by ourself when we use a different library.

He starts by talking a bit about the Aura.Di container and how it's different than what Pimple has to offer. He then links to a small library that makes the bridge between Slim 3 and Aura.Di and sets up the services Slim needs to operate correctly. He then steps through the code needed to integrate this into a simple Slim application based on this skeleton. Most of the work is done in the dependencies.php file where Slim's needs are set up, configured and injected into the container.

tagged: auradi dependency injection container slim3 pimple replace tutorial

Link: http://blog.shameerc.com/2015/09/slim-3-replacing-pimple-with-auradi

Rob Allen:
Accessing services in Slim 3
Jun 23, 2015 @ 10:51:36

Rob Allen has a new post to his site today showing you how to access services in a Slim 3 application using container injection instead of the previous "getInstance" method.

One of the changes between Slim Framework 2 and 3 is that the application singleton has gone. [...] In general, you didn't need access to $app itself, but rather you wanted access to something that the app knows about, such as a database adapter, or the router for access to the urlFor method to create a URL to a route. With Slim 3, there is no getInstance() on App, so you need to inject the instances of whatever you need where ever you need them.

He shows you how to create a simple Slim dependency injection container (service locator?) and push two kinds of objects in for later reuse. He shows how to reference this container from inside of your routes in both the callable/closure and class contexts. He also includes an example of referencing the same container from inside middleware (again in both the closure and class contexts).

tagged: slim microframework framework slim3 service access container this

Link: http://akrabat.com/accessing-services-in-slim-3/

New Media Campaigns:
Docker for PHP Developers
Jun 02, 2015 @ 10:29:38

The New Media Campaigns site has posted a new tutorial today introducing PHP developers to Docker, the handy tool to create containers for your applications a bit simpler and more efficient than just something like Vagrant.

I've used Vagrant to manage local development servers for several years. Vagrant is, according to its official website, a tool to "create and configure light-weight, reproducible, and portable development environments." [...] However, Vagrant has one large downside—it implies hardware virtualization. This means each project runs atop a full virtual machine, and each virtual machine has a complete operating system that demands a large overhead in system resources.

[...] There is another solution, though. Have you heard of Docker? I first heard this word a year ago. It's all about containers, I was told. Awesome. What are containers?, I thought. I dug deeper, and I read all about containerization, process isolation, and union filesystems.

He starts with a brief introduction to what Docker is and two of the key concepts: containers and images. He then talks about how Docker is different from Vagrant, including the extensibility and lighter resource demands. Following all this he starts in on building an actual application in a container. He walks you through each step, including commands, to build the container and image that will result in the final instance running Ubuntu, MySQL, Nginx and PHP-FPM. He sets up a simple "Hello World" page and shows how to configure the Nginx server to serve it up as well as the MySQL server to cooperate with PHP and run locally.

tagged: docker introduction container image configure server setup tutorial

Link: http://www.newmediacampaigns.com/blog/docker-for-php-developers

Dependency Injection tutorial
May 06, 2015 @ 11:16:25

If you've heard the term "dependency injection" but are still a little fuzzy on the concept, you should check out this new post to the MyBuilder.com site introducing you to some of the basic concepts and using it in some PHP-based examples. They focus on the use of a dependency injection container in this tutorial (versus something like constructor or setter injection).

A lot has been written about dependency injection or DI (for short) in PHP, but it's a bit difficult to find a tutorial showing how a DI container actually works. The objective of this post is to show the internals and concepts of a DI container.

They start with a brief look at what a dependency injection container is and how it's different from a service locator or regular autoloading. They mention some of the benefits it provides and get into the simple example. They start with a class that creates a hard dependency in the constructor and show how to refactor that out to constructor injection. They then take the next step and replace the constructor injection with a DI container injection and how its internals are set up to provide new instances of requested objects (via a services definition).

tagged: dependency injection di container tutorial introduction

Link: http://tech.mybuilder.com/dependency-injection-tutorial/

Cody Kennedy-Darby:
Testing Your Current Code Against PHP7 Or HHVM
Apr 01, 2015 @ 08:49:11

On Medium.com Cory Kennedy-Darby has a quick post showing you how you can test your current code against the latest versions of PHP 7 with the help of DUnit.

DUnit (dee-unit) makes your life easier by allowing you to run your unit tests on different versions of PHP or HHVM. Different versions are possible by using Docker containers. Thanks to @danbruce each of the Docker containers are only, ~35 MB in size. [...] PHP7 isn’t that far away. In fact, it is scheduled for release in ~8 months in November. Now is the perfect time to start testing your code against PHP7 nightly.

He starts with a few reasons you might want to test your code and things you can do to start "thinking forward" to when it is released. He then shows you how to install DUnit (more detail here) and use it to test on both PHP 7 and HHVM builds.

tagged: nightly test unittest build dunit docker container php7 hhvm

Link: https://medium.com/@ckdarby/testing-your-current-code-against-php7-or-hhvm-2f0ab059af78

Laravel News:
5 Resources to Learn about the Laravel IoC Container
Jan 02, 2015 @ 10:04:59

The Laravel News site has a post today linking to five handy resources you can use to learn about the Laravel IoC (inversion of control, dependency injection) container.

The Laravel IoC container is a powerful tool for managing class dependencies. It is widely used in Laravel and an important tool for your arsenal. The community has created several tutorials for this and here are five resources that will teach you all about it. [...] By reading these tutorials you’ll be up to speed in no time on the Laravel IoC container and also improve your code by implementing it in your application.

As a "bonus" there's also a link to a video narrated by Laravel creator Taylor Otwell himself about the IoC container and its use.

tagged: laravel inversion control ioc container dependency injection tutorials

Link: https://laravel-news.com/2014/12/5-resources-learn-laravel-ioc-container/

Remi Collet:
PHP-FPM in Docker
Dec 12, 2014 @ 11:57:35

Remi Collet has a new post today showing you how to get PHP-FPM up and running with Docker using a few simple lines in the Dockerfile. Docker is a toolset that lets you easily create and provision containers with scripted configurations (and link them together).

[The] use case [for this is] running php 5.3.3 on a Fedora 20 / 21 development workstation, for production deployment on RHEL-6 (as no php 5.3 SCL exists). This example can be easily adapted for all available PHP versions available as RPM (5.3.3 in RHEL-6, 5.4.16 in RHEL-7, 5.4.16 and 5.5.6 in RHSCL 1.2 or using a third party repository).

The contents of the Dockerfile are included, making a call to yum to install all the needed packages, make a few replacements in the www.conf configuration file and create the default "www" directory. Finally, it fires up the PHP-FPM server with the IP given in the startup. The commands to create the container and launch it are also included in the post.

tagged: tutorial phpfpm docker container create configure

Link: http://blog.famillecollet.com/post/2014/12/11/PHP-FPM-in-Docker