Service Container. A modern PHP application is full of objects. One object may facilitate the delivery of email messages while another may allow you to persist information into a database. In your application, you may create an object that manages your product inventory, or another object that processes data from a third-party API. The point is that a modern application does many things and is organized into many objects that handle each task. This chapter is about a special PHP object in Symfony2 that helps you instantiate, organize and retrieve the many objects of your application.
This object, called a service container, will allow you to standardize and centralize the way objects are constructed in your application. The container makes your life easier, is super fast, and emphasizes an architecture that promotes reusable and decoupled code. Since all core Symfony2 classes use the container, you'll learn how to extend, configure and use any object in Symfony2. What is a Service? Note Service Parameters. Php - Symfony autoloading structure.
Autoload - Is symfony's autoloader clever enough to only load necessary files. How to use Best Practices for Structuring Bundles (2.0) Autoloading in PHP and the PSR-0 Standard. Let’s say you have the file Rectangle.php which contains the definition for a Rectangle class. Before you can create an instance of the object elsewhere in your code, you first need to pull in the Rectangle.php file, perhaps by writing something like this: Normally we put each class’ definition in its own file for better organization, and so you need to require/include each of the class files you want to use.
If there are only a few files then it isn’t too much of a problem, but oftentimes that’s not the case. It can be very cumbersome to load a large library including all of its dependencies like this. In this article I’ll walk you through the “history of autoloading,” from the older to the current PSR-0 standard autoloader approach found in many PHP frameworks such as Lithium, Symfony, Zend, etc.
Then I will introduce you to the ClassLoader component from the Symfony2 project for PHP 5.3 which follows the PSR-0 standard. Autoloading in the “Olden Days” PSR-0 Standard Summary. Symfony framework forum • View topic - PROBLEM WITH AUTOLOADER SYMFONY 2. Fig-standards/accepted/PSR-0.md at master · php-fig/fig-standards. 2 versus Flat PHP. If you've never used a PHP framework, aren't familiar with the MVC philosophy, or just wonder what all the hype is around Symfony2, this chapter is for you.
Instead of telling you that Symfony2 allows you to develop faster and better software than with flat PHP, you'll see for yourself. In this chapter, you'll write a simple application in flat PHP, and then refactor it to be more organized. You'll travel through time, seeing the decisions behind why web development has evolved over the past several years to where it is now. By the end, you'll see how Symfony2 can rescue you from mundane tasks and let you take back control of your code.
A Simple Blog in Flat PHP In this chapter, you'll build the token blog application using only flat PHP. To begin, create a single page that displays blog entries that have been persisted to the database. That's quick to write, fast to execute, and, as your app grows, impossible to maintain. No error-checking: What if the connection to the database fails? Tip. 2 and HTTP Fundamentals. Congratulations! By learning about Symfony2, you're well on your way towards being a more productive, well-rounded and popular web developer (actually, you're on your own for the last part).
Symfony2 is built to get back to basics: to develop tools that let you develop faster and build more robust applications, while staying out of your way. Symfony is built on the best ideas from many technologies: the tools and concepts you're about to learn represent the efforts of thousands of people, over many years. In other words, you're not just learning "Symfony", you're learning the fundamentals of the web, development best practices, and how to use many amazing new PHP libraries, inside or independently of Symfony2. So, get ready. True to the Symfony2 philosophy, this chapter begins by explaining the fundamental concept common to web development: HTTP.
HTTP is Simple HTTP (Hypertext Transfer Protocol to the geeks) is a text language that allows two machines to communicate with each other. Note.