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Home > Web Development > Front End Web Development > Symfony2 Essentials
Symfony2 Essentials
Symfony2 Essentials

Symfony2 Essentials:

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Symfony2 Essentials

Chapter 2. Your First Pages

Most modern PHP frameworks follow a classic MVC concept. Symfony2 is also an MVC framework, so we do have controllers, models, and views. In this chapter, we will learn about these building blocks to see how Symfony2 organizes things:

  • Review of the default bundle structure and recommendations
  • Setting up the first routings and controllers for the home screen
  • Working with templates
  • Creating the initial database schema and models
  • Loading sample fixtures
  • Looking into migration throughout the chapter

Everything is a bundle

In the previous chapter, we dug in to the basic Symfony2 directory structure. Within the src directory, we already had two bundles: one called DemoBundle within the Acme subdirectory and the other one within AppBundle.

DemoBundle is a showcase of an example bundle that has existed since the beginning of Symfony2. It has been created to demonstrate how Symfony2 organizes things. AppBundle is a relatively new thing, introduced in Symfony 2.6 with a new concept of work.

Until the 2.6 version, it was recommended to contain a bundle within the vendor namespace. With Symfony 2.6 and its new best practices rules, it is now recommended to keep the custom application code within the handy AppBundle and create other bundles only if you want to create reusable code to be shared among your other projects.

Bundles don't have a fixed directory structure. In fact, you can have a bundle without most of the directories. If you create a utility bundle, it will probably have only...

The configuration format

Symfony2 can handle configuration in different formats: YAML, XML, and annotations. The main configuration files within app/config are provided with the YAML format. XML is usually harder to read, and is used only with third-party bundles.

While both YAML and XML configuration are pretty straightforward and need no explanations, we should stop by annotations for a while. As an example, see the AppBundle/Controller/DefaultController class:

namespace AppBundle\Controller;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;

class DefaultController extends Controller
{
    /**
     * @Route("/", name="homepage")
     */
    public function indexAction(Request $request)
    {
        // replace this example code with whatever you need
        return $this->render('default/index.html.twig', array(
            'base_dir' => realpath(
                $this-&gt...

Cleanups

Before we start writing our own app, we need to do some cleanups. We need to configure AppBundle to use the YAML configuration. While this is possible to switch the configuration format manually, we will remove the bundle (it doesn't contain much code yet), and we will generate a new bundle to demonstrate new bundle creation.

Recreating AppBundle

To recreate AppBundle, remove it first as follows:

$ rm -rf src/AppBundle

Remove it from app/AppKernel.php by removing the following line:

new AppBundle\AppBundle(),

Remove it's routing (app/config/routing.yml), which is as follows:

app:
    resource: @AppBundle/Controller/
    type:     annotation

Now we will need to generate it again. Issue the following command:

$ php app/console generate:bundle --namespace=AppBundle

Now provide the following answers to the generator:

Bundle name [AppBundle]: [Enter]
Target directory [.../todoapp/src]: [Enter]
Configuration format (yml, xml, php, or annotation): yml
Do you want to generate the whole...

Routing

Like with many other frameworks based on the concept of MVC, before any controller is actually executed, Symfony2 needs to know how to handle it. The Symfony routing configuration starts within the app/config/routing_*.yml file. Depending on which environment you fire up, this version of routing is fired up. Usually, this environment file loads the main app/config/routing.yml file, which loads other files from vendors, bundles, and so on. You can, of course, directly define your own single routings here, but it's usually recommended to keep the bundle-specific routings within the bundle itself, while using the main routing only to import resources.

As per the example provided earlier in this chapter, we know our app tries to import another resource file defined as @AppBundle/Resources/config/routing.yml. The @BundleName syntax is a shortcut to the bundle namespace (in our case AppBundle) but namespace can be longer if you include the vendor in your name. Let's take a look...

Templates – the View layer

Each MVC framework offers the View layer, and Symfony2 is no different. In Symfony1, we were using plain PHP code. Symfony has introduced a new templating engine named Twig. The Symfony syntax is more elegant — it's shorter and designed to be cleaner than regular PHP code in templates.

Note

We can still use it now. However, it's not the recommended approach, as in most cases, you will not find examples of a working bundle code in pure PHP.

Let's take a look at the template code within our bundle, src/AppBundle/Resources/views/Default/index.html.twig:

Hello {{ name }}!

Yes, this is it. As you can figure out, {{ name }} outputs the variable name. It is an equivalent of <?php echo $name; ?>. The code actually doesn't do much, and it is not a valid HTML code (it just outputs some text). Let's modify it a little:

{% extends '::base.html.twig' %}

{% block body %}
Hello {{ name }}!
{% endblock body %}

Now try to fire http...

Everything is a bundle

In the previous chapter, we dug in to the basic Symfony2 directory structure. Within the src directory, we already had two bundles: one called DemoBundle within the Acme subdirectory and the other one within AppBundle.

DemoBundle is a showcase of an example bundle that has existed since the beginning of Symfony2. It has been created to demonstrate how Symfony2 organizes things. AppBundle is a relatively new thing, introduced in Symfony 2.6 with a new concept of work.

Until the 2.6 version, it was recommended to contain a bundle within the vendor namespace. With Symfony 2.6 and its new best practices rules, it is now recommended to keep the custom application code within the handy AppBundle and create other bundles only if you want to create reusable code to be shared among your other projects.

Bundles don't have a fixed directory structure. In fact, you can have a bundle without most of the directories. If you create a utility bundle, it will probably have only some...

The configuration format

Symfony2 can handle configuration in different formats: YAML, XML, and annotations. The main configuration files within app/config are provided with the YAML format. XML is usually harder to read, and is used only with third-party bundles.

While both YAML and XML configuration are pretty straightforward and need no explanations, we should stop by annotations for a while. As an example, see the AppBundle/Controller/DefaultController class:

namespace AppBundle\Controller;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;

class DefaultController extends Controller
{
    /**
     * @Route("/", name="homepage")
     */
    public function indexAction(Request $request)
    {
        // replace this example code with whatever you need
        return $this->render('default/index.html.twig', array(
            'base_dir' => realpath(
                $this->container
                     ->getParameter...

Cleanups

Before we start writing our own app, we need to do some cleanups. We need to configure AppBundle to use the YAML configuration. While this is possible to switch the configuration format manually, we will remove the bundle (it doesn't contain much code yet), and we will generate a new bundle to demonstrate new bundle creation.

Recreating AppBundle

To recreate AppBundle, remove it first as follows:

$ rm -rf src/AppBundle

Remove it from app/AppKernel.php by removing the following line:

new AppBundle\AppBundle(),

Remove it's routing (app/config/routing.yml), which is as follows:

app:
    resource: @AppBundle/Controller/
    type:     annotation

Now we will need to generate it again. Issue the following command:

$ php app/console generate:bundle --namespace=AppBundle

Now provide the following answers to the generator:

Bundle name [AppBundle]: [Enter]
Target directory [.../todoapp/src]: [Enter]
Configuration format (yml, xml, php, or annotation): yml
Do you want to generate the whole directory...

Routing

Like with many other frameworks based on the concept of MVC, before any controller is actually executed, Symfony2 needs to know how to handle it. The Symfony routing configuration starts within the app/config/routing_*.yml file. Depending on which environment you fire up, this version of routing is fired up. Usually, this environment file loads the main app/config/routing.yml file, which loads other files from vendors, bundles, and so on. You can, of course, directly define your own single routings here, but it's usually recommended to keep the bundle-specific routings within the bundle itself, while using the main routing only to import resources.

As per the example provided earlier in this chapter, we know our app tries to import another resource file defined as @AppBundle/Resources/config/routing.yml. The @BundleName syntax is a shortcut to the bundle namespace (in our case AppBundle) but namespace can be longer if you include the vendor in your name. Let's take a look at the bundle...

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Description

Symfony is a free and open source PHP MVC web application development framework, which helps you create and maintain web applications and replace recurrent coding tasks. It integrates with an independent library, PHPUnit, to give you a rich testing framework. It is one of the best and most popular frameworks available on the market. Popular projects such as Drupal, Laravel, and phpBB also use Symfony. Its well-organized structure, clean code, and good programming practices make web development a breeze. Symfony2 Essentials will guide you through the process of creating a sample web application with Symfony2. You will create a To-Do application, using a few of the most commonly used Symfony2 components, and discover how to perform these development tasks efficiently. This book introduces you to the Symfony framework with a quick installation guide and a brief explanation of its key features including the MVC architecture, twig templating, dependency injection, and more. You will learn to manage dependencies, create controllers, views, and API calls, and secure your application. Next, you will go through the steps that are common for most web applications, which include writing CRUD and AJAX, handling forms, validation, translations, and the command-line interface, and e-mail sending features. The book ends with best practices, debugging, profiling, and deployment procedures. By the end of this book, you will have learned how to combine a Symfony2 framework with other open source code to speed up the development process.

Who is this book for?

This book is aimed at experienced programmers, especially those familiar with a closely related technology such as Yii or Laravel, but who now want to learn Symfony quickly.
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Sep 08, 2015
Length: 158 pages
Edition : 1st
Language : English
ISBN-13 : 9781784398767
Category :
Web Development
Languages :
PHP
Concepts :
Front End Web Development
Tools :
Symfony

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Product Details

Publication date : Sep 08, 2015
Length: 158 pages
Edition : 1st
Language : English
ISBN-13 : 9781784398767
Category :
Web Development
Languages :
PHP
Concepts :
Front End Web Development
Tools :
Symfony

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Symfony2 Essentials
Symfony2 Essentials
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Mastering Symfony
Mastering Symfony
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Extending Symfony2 Web Application Framework
Extending Symfony2 Web Application Framework
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Symfony2 Essentials
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Mastering Symfony
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Table of Contents

11 Chapters
1. The Symfony Framework – Installation and Configuration Chevron down icon Chevron up icon
1. The Symfony Framework – Installation and Configuration
Key reasons to choose Symfony2
The history of Symfony
Installation
Installing Symfony2 using an installer
The Symfony2 directory structure
The configuration files
The Symfony2 console
Summary
2. Your First Pages Chevron down icon Chevron up icon
2. Your First Pages
Everything is a bundle
The configuration format
Cleanups
Routing
Templates – the View layer
Entities – the Model layer
Migrations
Fixtures
Summary
3. Twig Templating and Assets Handling Chevron down icon Chevron up icon
3. Twig Templating and Assets Handling
The Twig templating engine
Creating a list of tasks
Summary
4. Forms Chevron down icon Chevron up icon
4. Forms
Form creation
Validation and form processing
Theming form elements
Transforming data
Summary
5. Security and Handling Users Chevron down icon Chevron up icon
5. Security and Handling Users
Security handling
Installing the user manager bundle
User registration
Summary
6. Translation Chevron down icon Chevron up icon
6. Translation
Translations
Summary
7. AJAX Chevron down icon Chevron up icon
7. AJAX
Installing and configuring REST features
Summary
8. Command-line Operations Chevron down icon Chevron up icon
8. Command-line Operations
Creating the console command
Swiftmailer
Logging
Summary
9. Symfony2 Profiler and Debugger Chevron down icon Chevron up icon
9. Symfony2 Profiler and Debugger
The Web Debug Toolbar
The Symfony2 profiler
Data collectors
The stopwatch component
Summary
10. Preparing an Application for Production Chevron down icon Chevron up icon
10. Preparing an Application for Production
Preparing an application
Deployment strategies
Summary
Index Chevron down icon Chevron up icon
Index

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Madchu Oct 08, 2017
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
It took me two attempts to get through this, but that was mainly because I've been trying to learn everything and Symfony, at first glance, was a little daunting. The author covers things well, though, so I'm glad I gave this a second go. it complements well with an online course on Symfony from KNP University which is the best I've found so far on the subject.
Amazon Verified review Amazon
AlberT Nov 08, 2016
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Un libro che scorre facilmente, affronta più o meno tutti gli aspetti del ciclo di vita di una applicazione symfony ..Nulla di particolarmente illuminante, ma sicuramente una buona infarinatura generale.
Amazon Verified review Amazon
D. Cullen Feb 21, 2017
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Mistakes in the examples make it tricky for someone completely new to symfony, but otherwise ok.
Amazon Verified review Amazon
Spurgeon Jun 07, 2016
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Good book for experienced PHP developers to acquaint themselves with Symfony. Considering that Symfony 3 is out some time back, this might be slightly outdated. Nevertheless, the foundations / fundamentals hold good.
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Amazon Customer Feb 15, 2016
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
very basic book, you could find better guides on the web.
Amazon Verified review Amazon

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About the author

Profile icon Wojciech Bancer
Wojciech Bancer
Wojciech Bancer has a master's degree in computer science. He has over 10 years of experience in web application development. In 2007, after passing the Zend exam, he received a Zend Certified Engineer for PHP5 certificate. He started his career as a freelancer and consultant by developing web applications in PHP 4 and PHP 5. He has led many IT projects for clients in Europe and USA. Currently, Wojciech is a managing partner of a software organization and is in charge of the R&D structure of one of the fastest growing iBeacon projects in Europe.
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Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela