Drupal Interview Questions
An Overview of Drupal
Drupal is an open source PHP content-management framework distributed under the GNU General Public License. The frame provides back-end framework for at a lot of websites worldwide. It offers a sophisticated API, and the basic installation and administration require no programming skills. It runs on any platform that supports a server capable of running PHP and a database for storing content. To get into complete the complete details about Drupal Interview Question we are mentioning Questions and Answers that can be a help to you.
Development History
Drupal was written as a message board by Dries Buytaert. In the year 2001, it became open source.
Latest Version: The current version is Drupal 8.6.5 released in Jan 2019. This question was frequently asked in Drupal interview questions and answers.
Advantages
- Quicker content authoring
- Flexible architecture.
- It is designed for the mobile-first environment.
- Better language support.
The following are the Drupal Interview Questions and Answers for Experienced that are most likely to be asked:
Most Frequently Asked Drupal Interview Questions And Answers With Examples:
- What is DRUSH used in Drupal?
- What do you mean by node in Drupal?
- What do you mean by hooks in Drupal?
- What is taxonomy in Drupal?
- List the required files for theme in Drupal?
- List the required files for modules in Drupal?
- What do you mean by subtheme in Drupal?
- How to modify the form validation in Drupal?
- Why we used template.php in Drupal?
- What are the new features of Drupal 8?
- Which design pattern used by Drupal?
- How to add custom PHP codes in pages using Drupal?
- Which is the best module for implementing Search in Drupal 8?
- How to install Drupal?
- How can we add Regions in Drupal Theme and list some Default Regions?
- What is difference between drupal 7 and 8?
- What is dependency injection in Drupal 8?
- What are services in Drupal 8?
- How to enable a module in Drupal 8?
- What are the difference between WordPress and Drupal?
- List the system requirements for Drupal installation?
- Is Drupal is a CMS? Explain
- What is the latest version of Drupal?
- What is caching in Drupal Framework? Explain
- What do you mean by PDO in Drupal and how to enable PDO?
- What is module and List out some of the modules used in Drupal?
- Explain the SEO modules available in Drupal?
- What are the Databases Drupal supports?
- What do you mean by "Ctools" in Drupal?
- What do you mean by patch in Drupal?
It is a very useful tool as it helps you perform various admin tasks using one or two commands in the terminal, replacing the need for many clicks and page refreshes in the UI. "DRUSH" is an awesome shell interface for managing Drupal right from our cloud server using command line.
It is a piece of individual content such as a page, poll and article. Most content on a Drupal website is stored/treated as "nodes".
Hooks are how modules can interact with the core code of Drupal. They make it possible for a module to define new urls and pages within the site like hook_menu, to add content to pages like hook_block, hook_footer, to set up custom database hook_schema and more.
It is a powerful core module, gives our sites use of the organizational keywords known in another systems as categories or tags, or metadata. Taxonomy allows you to connect, relate and classify your website's content. These terms are gathered within "vocabularies". It is the practice of classifying content.
- style.css
- page.tpl.php
- info file
- template.php
- node.tpl.php
- block.tpl.php
- modulename.info
- modulename.module
- optional modulename.install
It are just like any other theme, with one difference:
They inherit the parent theme's resources.
It has no limits on the chaining capabilities connecting sub themes to their parents.
We can use form alter hook and use this "'#required => true"
It allows you to override a theme function. It is available in the theme directory.
- New Theme Engine : It includes a brand new theming engine called Twig. It is PHP-based, flexible, fast, and secure.
- Drupal 8 is mobile first now
- It has extensive multilingual features right out of the box.
- It has configuration management built into it at the file-system level so that carrying over configuration elements in Drupal 8.
- Easy Authoring : It bring unprecedented power into the hands of the Content Editor, with WYSIWYG editor CKEditor now bundled with the core.
- Views Now Part of its Core :
- Better Support for Accessibility
- Web Services in-Built in Drupal 8
- In Drupal 8 it has Guided Tour
- JavaScript Automated Testing in Drupal 8
- Loading Speed improvement in Drupal 8.
Drupal does not allow adding PHP code directly inside a post or in a block by default.
To do this, we need to activate a drupal module called PHP filter via Administer Site building Modules.
Adding regions to a theme requires two things that's are given below :-
- Adding region meta-data to your
THEMENAME.info.ymlfile. - Please edit your
page.html.twigfile then print new regions.
Default Regions
- page.header
- page.primary_menu
- page.secondary_menu
- page.highlighted
- page.help (It has dynamic help text for admin pages)
- page.content (main content of current page)
- page.sidebar_first
- page.sidebar_second
- page.footer
- page.breadcrumb
Detailed system requirements for a Drupal 8 installation.
- Websites built in Drupal 8 core are compatible with, and fully functional in, all latest browsers support CSS and JavaScript.
- Database server to run Drupal 8
- Drupal 8 works on web servers with PHP 5.5.9 or greater.
- Detailed information regarding the PHP requirements for Drupal 8.
- 32-bit PHP can only support a limited range of dates.
For more detail you can visit its official website : Click here
It is a Content Management Framework, from which we can build a CMS tailored specifically for our needs.
Caching is a popular technique to optimize the website. Caching is a process that stores HTML, CSS, Image in some accessible space. It allows us to speed up our website using different configuration like page caching, block caching and lifetime for cached pages.
It is an acronym for PHP Data Objects. It is a lean, consistent way to access databases. PDO is just like a data access layer which uses a unified API.
To enable PDO, configure --enable-pdo and --with-pdo-sqlite --with-pdo-mysql or whatever database needs supporting by PDO
For windows users : For Apache, you will need to make sure php_pdo.dll and php_pdo_mysql.dll exist in the php/ext directory, un-comment or add the appropriate lines in php.ini, after that you have to restart the web server. In windows it may no longer be required to enable PDO when using newer versions of PHP, PHP version 5.3 and later. It refers to php_pdo.dll. However, you still need to activate php_pdo_mysql.dll for MySQL or for whichever database you are using.
A Module is a collection of files which containing some functionality and is written in PHP because the module code executes within the context of the site.
In Drupal some of the modules recommended here :-
- Views
- Token
- Ctools
- Quicktabs
- Pathauto
- Webform
- Google Analytics etc
Some of SEO modules available in Drupal thats are given below:-
- Pathauto
- Meta tags/ Node words
- Service Links
- Google Analytics
- Related Links
- Search 404
- Site map
- Url list
Drupal supports MySQL, MariaDB, PostgreSQL and SQLite.
It is an advanced web-based course and collaboration environment. It is a set of tools designed to help instructors, researchers and students create course websites and project websites. It include Views and Panels.
It is a structured file that consists of a list of differences between one set of files and another. All code changes, additions, or deletions to Drupal core and contributed modules or themes between developers are done through patches in Drupal.