25+ Drupal Interview Questions and Answers

Drupal an open-source and free Content Management System. It is written in PHP. It is used as a back-end framework. It ranges from personal blogs to corporate, political, and government sites.

The most commonly used PHP-based CMSs include Drupal, Joomla, Magento, and WordPress. 

Drupal is popular due to its robust performance, superior security features, and scalability. This makes it suitable for websites of all sizes. It's also highly customisable and can support numerous modules and themes that can adapt to virtually any requirement. 

The basic requirements for Drupal installation include a web server (Apache, Nginx, or Microsoft IIS), PHP (version 7.3 or higher recommended), and a database like MySQL, MariaDB, PostgreSQL, or SQLite. 

Key features of Drupal include its flexible content architecture, high scalability, extensive API support, reliable performance, and strong security measures. It also has a large community and thousands of modules and themes. 

In Drupal, a module is the collection of files that contains some functionality and is written in PHP. Modules extend Drupal's core capabilities and add new features or customise Drupal's behaviour and appearance. 

In Drupal, a module is the collection of files that contains some functionality and is written in PHP. Modules extend Drupal's core capabilities and add new features or customise Drupal's behaviour and appearance. 

A sub-theme in Drupal is a theme that inherits resources from another theme, called the base theme. Sub-themes allow you to override resources of the base theme, providing flexibility in customising the appearance of your site. 

PDO stands for PHP Data Objects. It is a database access layer providing a uniform method of access to multiple databases. 

DRUSH, or Drupal Shell, is a command line shell and scripting interface for Drupal. It helps in managing and administering Drupal websites efficiently. 

Yes, Drupal can be run on the command line using DRUSH, which provides powerful command line tools to interact with Drupal right from the terminal. 

Ctools is a set of APIs and tools to help developers improve their Drupal websites. It includes features like modal dialogue, content type management, and views content panes, among others. 

Render arrays are the absolute basic building blocks of Drupal content. They provide a structured way to programmatically alter the content before it is displayed. 

In the context of Drupal, patches are pieces of code that fix bugs, add new features, or solve security vulnerabilities in a Drupal site. They are used to modify Drupal core and contributed modules/themes. 

No, it is not possible to disable core required modules through the Drupal administration interface. This is because they are essential for Drupal to function correctly. 

Drupal uses a database abstraction layer, which allows you to use different database systems without changing the core code. It supports several types of databases, such as MySQL/MariaDB, PostgreSQL, and SQLite. 

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Drupal supports MySQL/MariaDB, PostgreSQL, and SQLite databases.

To drop a table using a module in Drupal, you can use the `db_drop_table()` function within your module's `.install` file, specifying the table to be removed. 

Drupal distributions are full copies of Drupal that include Drupal core. In addition to the main software, there are also other programs such as themes, modules, libraries, and installation profiles that can be installed. They provide a quick starting point tailored for specific use cases. 

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The 'weight' in Drupal is used to specify the order of processing or displaying various elements, such as modules, fields, or even menu items. Lower weights are processed first. 

Drupal cron handles tasks that need to be executed periodically, such as checking for updates, publishing scheduled posts, or cleaning up database logs. 

Drupal cron handles tasks that need to be executed periodically, such as checking for updates, publishing scheduled posts, or cleaning up database logs. 

The five conceptual layers in Drupal are data (nodes, entities), modules (extends functionality), themes (presentation), distribution (pre-configured customisation), and core (base system). 

The API in Drupal 7 provides numerous functions that developers can use to perform operations, allowing them to create and manage content, users, and various services programmatically. 

A node in Drupal is any piece of individual content. For example, a page, poll, article, blog entry, or forum topic. 

The `template.php` file in a Drupal theme is where theme customisation and preprocessing functions are stored. It's used to override default theming functions. 

The 'search' function in Drupal is highly efficient and customisable, offering advanced search capabilities, including the use of search modules and hooks for refining search results. 

Hooks are functions that allow modules to interact with the Drupal core. They make it possible for modules to alter or extend the behaviour of Drupal's core functionalities.