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Design patterns in Drupal

Patterns
Drupal follows best practices in software development by utilizing various design patterns. Design patterns are established solutions for common programming challenges, providing a structured and reusable approach to software design. In Drupal, these design patterns are used to ensure extensibility, flexibility, scalability and maintainability of the CMS. From the Observer pattern for event handling, to the Plugin pattern for modular functionality, to the Factory pattern for object creation, Drupal leverages a variety of design patterns to implement its robust architecture. This introduction provides a glimpse into the key design patterns used in Drupal CMS, which play a crucial role in shaping its modular and flexible nature

SOLID principles in Drupal

Drupal
As one of the most popular open-source content management systems (CMS), Drupal provides a powerful platform for building complex web applications. To ensure that Drupal projects are scalable, maintainable, and extensible, it is essential to follow best practices for writing modular and clean code. One such set of principles that can greatly aid in achieving these goals is SOLID principles. SOLID is an acronym that represents a set of five principles - Single Responsibility Principle (SRP), Open/Closed Principle (OCP), Liskov Substitution Principle (LSP), Interface Segregation Principle (ISP), and Dependency Inversion Principle (DIP). In this article, we will explore how to apply SOLID principles in Drupal development with examples.

How dependency injection works in Drupal?

Drupal
In Drupal, dependency injection is implemented using the Symfony Dependency Injection component, which is a popular PHP library for managing dependencies in object-oriented applications. Drupal is built on top of Symfony framework and leverages its components for various functionalities, including dependency injection

How to create nested vertical tabs in Drupal 9 config form?

Here's how you can create nested vertical or horizontal tabs in Drupal Form API:

  1. Define your configuration form using the Drupal Form API by creating a new form class that extends ConfigFormBase or FormBase.

  2. Add a vertical_tabs element to your form using the Drupal\Core\Render\Element\VerticalTabs class. This will create the top-level vertical tabs.

  3. Inside each top-level vertical tab, add another vertical_tabs element to create the nested vertical tabs.

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How to increase php memory limits only for Drush commands in Drupal settings file

To increase the PHP memory limit for all PHP CLI (Command Line Interface) commands in Drupal, you can add a configuration to the settings.php file. Here's how to do it:

  1. Open the settings.php file for your Drupal installation. This file is usually located in the sites/default folder of your Drupal installation.

  2. Add the following lines of code to the bottom of the settings.php file:

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Drupal security best practices

Drupal Security
I was recently looking certain random things for all Drupal sites that I know to see what information I can get from these sites and I was surprised to see that many of them do not have the basic Drupal security recommendations done. For example, I could tell the exact Drupal, PHP and Nginx versions in many cases. Some of the sites were on Drupal versions that were vulnerable. So I decided to write a checklist that if followed exactly will take care of at least the recommended best practices.
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