Databases and the Doctrine ORM

One of the most common and challenging tasks for any application

involves persisting and reading information to and from a database. Although

the Symfony Framework doesn't integrate any component to work with databases,

.. _`newer utf8mb4 character set`: https://dev.mysql.com/doc/refman/5.5/en/charset-unicode-utf8mb4.html

.. _`Transactions and Concurrency`: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/transactions-and-concurrency.html

.. _`limit of 767 bytes for the index key prefix`: https://dev.mysql.com/doc/refman/5.6/en/innodb-restrictions.html

How to Work with Doctrine Associations / Relations

Suppose that each product in your application belongs to exactly one category.

In this case, you'll need a ``Category`` class, and a way to relate a

``Product`` object to a ``Category`` object.

.. _`Association Mapping Documentation`: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/association-mapping.html

.. _`Association Updates`: http://docs.doctrine-project.org/en/latest/reference/unitofwork-associations.html

Forms

Dealing with HTML forms is one of the most common - and challenging - tasks for

a web developer. Symfony integrates a Form component that makes dealing with

forms easy. In this article, you'll build a complex form from the ground up,

.. _`Symfony Form component`: https://github.com/symfony/form

.. _`DateTime`: https://php.net/manual/en/class.datetime.php

.. _`2.8 UPGRADE Log`: https://github.com/symfony/symfony/blob/2.8/UPGRADE-2.8.md#form

Managing CSS and JavaScript

Symfony ships with a pure-JavaScript library - called Webpack Encore - that makes

working with CSS and JavaScript a joy. You can use it, use something else, or just

create static CSS and JS files in your ``web/`` directory and include them in your

.. _`Mix`: https://laravel.com/docs/5.4/mix

.. _`Symfony`: http://symfony.com/

.. _`Full API`: https://github.com/symfony/webpack-encore/blob/master/index.js

create a Symfony ``Response`` object, which can hold HTML content, a JSON

string or even a binary file like an image or PDF.

Do you prefer video tutorials? Check out the `Joyful Development with Symfony`_

.. seealso::

.. _`Twig`: https://twig.symfony.com

.. _`Composer`: https://getcomposer.org

Security

Symfony's security system is incredibly powerful, but it can also be confusing

to set up. In this article you'll learn how to set up your application's security

step-by-step, from configuring your firewall and how you load users, to denying

.. _`frameworkextrabundle documentation`: https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/index.html

.. _`HWIOAuthBundle`: https://github.com/hwi/HWIOAuthBundle

.. _`Symfony ACL bundle`: https://github.com/symfony/acl-bundle

Service Container

Your application is *full* of useful objects: a "Mailer" object might help you

send emails while another object might help you save things to the database.

Almost *everything* that your app "does" is actually done by one of these objects.

.. _`service-oriented architecture`: https://en.wikipedia.org/wiki/Service-oriented_architecture

.. _`Symfony Standard Edition (version 3.3) services.yml`: https://github.com/symfony/symfony-standard/blob/3.3/app/config/services.yml

.. _`glob pattern`: https://en.wikipedia.org/wiki/Glob_(programming)

This article explains how to install Symfony in different ways and how to solve

the most common issues that may appear during the installation process.

Do you prefer video tutorials? Check out the `Joyful Development with Symfony`_

Creating Symfony Applications

setup/composer

setup/*

.. _`Composer`: https://getcomposer.org/

.. _`Phar extension`: https://php.net/manual/en/intro.phar.php

.. _`Symfony Standard Edition`: https://github.com/symfony/symfony-standard