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Symfony uses a service container that can be used to efficiently manage services in the application. A schematic overview is shown in the following image. The DrupalKernel loads the environment (available services and modules) in a slightly different (but similar) way than Kernel, but delegates request handling to the HttpKernel, just like Symfony’s Kernel does.Furthermore, Drupal 8 brings its own (3 rd party) components and core code. Bundles provide a great way to build custom web applications, but are less suited for building a CMS that must be very flexible and extendible. This is because Drupal does not share the ‘bundle’ approach of Symfony. It offers the same type of functionality however by implementing the Kernel Interface. These bundles can be used to create ‘coherent’ pieces of functionality, much like modules in Drupal.ĭrupal uses only a some of Symfony’s components, which can be seen in the image below.ĭrupal does not extend Kernel, like a Symfony2 web app would. A developer may extend a system by extending the kernel, such as AppKernel extends Kernel, and adding his own bundles in there. This Kernel is basically the ‘main class’ that manages the environment (services and bundles) and has the responsibility of handling a http request. At the heart of the system is the Kernel component. Others are merely helper components, such as the Validator, that helps to validate data (is it a valid email address/url/number/etc?). Some are vital to the system, such as the Http Foundation component that understands HTTP and offers a nice request and response object used by the other components. The Symfony framework consists out of several components. This has resulted in a well-balanced system, that uses a good (and unmodified) part of the Symfony core, but extends it with a very flexible CMS layer. Instead, for Drupal 8 it was opted to just use the (excellent) core layers of Symfony and extend it to provide support for Drupal modules. But in practice, the default approach of Symfony was found not flexible enough for Drupal. In theory, a CMS could be written on top of Symfony. Symfony provides a way to do that efficiently.

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Instead, code must be written to create an application. Symfony is not a CMS, as it can’t be used to administer a site. The Symfony2 framework is designed to enable a developer to build custom web-based applications.

We’ll see which Symfony2 components are used in Drupal and how.

Here we’ll have a look at the general structure of the Drupal 8 framework, especially in relation to the Symfony2 components. We are thankful for the Drupal core developers for their braveness and work on this!

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And it’s a revolution! Not an evolution like Drupal 7 compared to Drupal 6, but a completely different architecture and coding methodology! We believe that the shift towards object orientation will appeal to developers and will improve the overall software quality.

The database can be PostgreSQL or SQLite instead of MySQL, or a MySQL-compatible replacement such as MariaDB or Percona.Other operating systems, web servers, and databases can also be made to work though, the scripts that the software uses are written in PHP, so that cannot be changed.ĭrupal 8 is here.

The web server can be Nginx or IIS instead of Apache.

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The operating system can be Windows or Mac OS instead of Linux. The base Drupal download, known as Drupal Core, contains the PHP scripts needed to run the basic CMS functionality, several optional modules and themes, and many JavaScript, CSS, and image assets.

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Apart from being free of licensing cost, Drupal comes inherently with the necessary functionalities.ĭrupal is a supple CMS based on the LAMP stack, with a modular design letting features to be added and removed by installing and uninstalling modules, and allowing the whole look and feel of the website to be changed by installing and uninstalling themes. Now with Drupal 8, it is much easier to drive value to the web application development for successful digital experiences. Drupal 8 taps into the concentrated innovation from its open source community. It’s fast, flexible and ideal for Rapid Application Development. Drupal 8 is the latest release of the world’s most widely used enterprise web CMS.

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