Magento 2 interview questions for developers

Magento 2 interview questions for developers

Class − This is a programmer-defined data type, which includes local functions as well as local data. You can think of a class as a template for making many instances of the same kind (or class) of object.

Object − An individual instance of the data structure defined by a class. You define a class once and then make many objects that belong to it. Objects are also known as instance.

Member Variable − These are the variables defined inside a class. This data will be invisible to the outside of the class and can be accessed via member functions. These variables are called attribute of the object once an object is created.

Member function − These are the function defined inside a class and are used to access object data.

Inheritance − When a class is defined by inheriting existing function of a parent class then it is called inheritance. Here child class will inherit all or few member functions and variables of a parent class.

Parent class − A class that is inherited from by another class. This is also called a base class or super class.

Child Class − A class that inherits from another class. This is also called a subclass or derived class.

Polymorphism − This is an object oriented concept where same function can be used for different purposes. For example function name will remain same but it make take different number of arguments and can do different task.

Overloading − a type of polymorphism in which some or all of operators have different implementations depending on the types of their arguments. Similarly functions can also be overloaded with different implementation.

Data Abstraction − Any representation of data in which the implementation details are hidden (abstracted).

Encapsulation − refers to a concept where we encapsulate all the data and member functions together to form an object.

Constructor − refers to a special type of function which will be called automatically whenever there is an object formation from a class.

Destructor − refers to a special type of function which will be called automatically whenever an object is deleted or goes out of scope.

New Features in PHP 7

SPEED

Type Declarations

– Strict(declare(strict_types=1);) and Non-strict

Error Handling

New Operators <=>

more secure random function

What is Magento?

Magento is an ecommerce platform that enables companies to run and manage their ecommerce sites in an optimized way. Magento functions as an open source ecommerce management system. It was first published by a Varien Inc in 2008, before being sold to eBay and ultimately spun off into its own entity. The 2.0 version of Magento arrived in November of 2015 and has improved the platform across the board.

Why is Magento valuable for businesses?

Magento is valuable for businesses because it gives them a high level of control and flexibility when they are managing the look, functionality, and content of their ecommerce store. The Magento software is both extremely convenient, and extremely effective for running an ecommerce operation.

Further, it has a number of features that make operating an ecommerce site easier compared to other options. Many of these features revolve around how financial transactions are made, and how content can be uploaded and optimized for search engine rankings.  

What are the different versions of Magento?

Magento categorizes their product across multiple offerings:

Magento Commerce

Magento Order Management

Magento Business Intelligence

Magento Shipping

Magento Social

Magento Open Source

Magento 2.2 is on the horizon (ETA September 2017) and it includes new features and improvements such as a new B2B Module, Advanced Reporting, and more. This version is sought after by businesses who want the most current technology.

What are some of the top features of Magento?

Payment

Reporting and Analytics

Customer Accounts

Product and Catalogue Browsing

Site Management

Search Engine Optimization

Customer Accounts

International Support

Checkout

Marketing Promotion and Tools

Order Management

What is MVC Architecture?

MVC, or Model, View, Controller, is a type of architecture in which business logic, data access, and user interface are separated for applications. MVC has two different types: configuration-based and convention-based. However, Magento uses the configuration-based version. This means that to get a module’s config file to work, everything must be specified to it.

Can you explain the technology that is used by Magento?

Magento uses MySQL for database and PHP as a web server scripting language. Specifically, it uses MySQL 5.6 (Percona or Oracle), and PHP 5.4 and 5.5. This technology makes up the core of Magento and is what gives the software its functionality.

Are there any limitations to the Magento software?

The Magento software is extremely useful and is one of the top ecommerce platforms available on the market. However, it does require a lot of space and memory. Furthermore, it requires object oriented programming in order to prevent turning into a very complex system. Finally, Magento can be slow in terms of performance, at times. However, these limitations are usually not a significant concern in most cases, and the benefits provided by the Magento Software usually far outweigh any potential issues.

How do you create a custom module in Magento?

In order to create a custom module in Magento, you must first – create a module directory, second – create controller, block, and module files for your module, third – create a module configuration file, and finally, fourth – create an XML file. The purpose of creating an XML file is so that you can enable or disable the module and also instruct the system which code pool that the module will be taken from.

How can you improve the performance of Magento?

There are a number of things that you can do to enhance and improve Magento performance.

Doing all of the following can improve Magento performance.

Disabling any modules that are not being used

Disabling the Magento log

MySQL Query Caching

Optimizing your image

Enabling Gzip Compression

Enabling Magento Caching

Combining the external CSS/JS into a single file

All of these things can speed up Magento and make it work better. This can be very helpful for both the ecommerce company, and for the customers of the company.

Which billing information can be managed through Magento?

All of the following things can be managed from the client account.

Adding a credit card

Adding a PayPal account

Updating a billing address

Producing a print-ready receipt

Viewing your billing history

Considering the fact that Magento is an ecommerce platform it is absolutely critical that all of this billing information can be managed through the platform. This is why all of these things are able to be managed through Magento.

How do you add a blog to Magento?

Blogs are very important for helping to increase the search engine rankings for an ecommerce site. To add a blog to Magento, you have two options, you can use a prebuilt Magento blog extension, or you can create a custom blog module. If you are going to set up a free pre-built blog extension, then you will need to first download the extension. You can get them from Aheadworks. Next, you need to install the blog extension. After that, you need to configure it. If you are going to build a custom blog, then you will have to create a module for it.

How many design patterns does Magento Have?

Magento has a total of 12 design patterns. These patterns include:

Factory Pattern

Singleton Pattern

Model View Controller Pattern

Front Controller Pattern

Registry Pattern

Prototype Pattern

Iterator Pattern

Object Pool Pattern

Service Locator Pattern

Lazy Loading Pattern

Observer Pattern

Module Pattern

How many tables will be created when you make a new EAV module?

If you make a new EAV module, then six tables will be created. These tables include:

module_datetime, module, module_decimal, module_int, module_text, and module_varchar.

What is Magento?

Magento is an open source-ecommerce web application developed by Varien, launched on 31st March 2008. Magento was built by using the part of Zend Framework and using the EAV (entity-attribute-value) database model to save the data. Now Magento is divison of eBay. On June 6 2011 eBay owns 100% of Magento.

Why use Magento 2?

Magento was stripped down and rebuilt from scratch to what is now a quicker, easier, and safer Magento 2 version.

Some of its advantages include:

It is very fast

It’s have New File Structure

It’s have New Layout Elements

CSS Preprocessing

Magento UI Library

Improved performance and scalability

Reducing upgrade efforts and costs

What are the features of Magento 2?

Here are the following key features of Magento 2:

Open and flexible architecture

Enhanced business agility and productivity

Engaging shopping experiences

Grade scalability and performance of the enterprise

Easier upgrades and maintenance

Secure Payments

Backup/Rollback system

What is MVC Architecture?

MVC, or Model, View, Controller, is a type of architecture in which business logic, data access, and user interface are separated for applications. MVC has two different types: configuration-based and convention-based. However, Magento uses the configuration-based version. This means that to get a module’s config file to work, everything must be specified to it.

What is EAV in Magento?

EAV, stands for Entity Attribute Value, is a technique which allows you to add unlimited columns to your table virtually. EAV also known as object attribute value model and open schema.

Entity (E): Entity actually refers to data item. For example we can consider it as customer, category or product.

Attribute (A): Attribute refers to the different attributes of the Entity. Like for example product have different attributes like color, size, price, etc.

Value (V): Value refers to the actual value of the attribute of the entity. Like color has value red, price has value $25, etc.

Which command is used to enable or disable a magento2 module?

php bin/magento module:enable NameSpace_ModuleName

php bin/magento module:disable NameSpace_ModuleName

Which file stores the vendor path?

Its vendor_path.php situated at app/etc/ folder.

Which file is responsible for keeping database credentials?

Its env.php situated at app/etc/ folder.

Which class Magento 2 helper extend?

\Magento\Framework\App\Helper\AbstractHelper

Which function refers the action in any controller file?

Its execute() function.

Which command is used to enable or disable a magento2 cache?

php bin/magento cache:enable

php bin/magento cache:disable

What is the difference between cache:clean and cache:flush?

Typically, cache:clean deletes all enabled cache related to magento whereas cache:flush deletes the whole cache storage, whether its magento cache or any third party cache (whether enabled or disabled)

What is resource attribute for admin menu item?

Resource attribute defines the ACL rule, that a user must have in order to access this Menu Item.

Where does all core modules are located in Magento2?

They are under vendor/magento folder.

Where are the module’s base definition file?

They are at app/code/Module/etc/module.xml.

What is headless architecture ? can we do it with Magento ?

What is PWA?

What is graphql ?

More technical questions

https://docs.google.com/spreadsheets/d/1i8ZDAceVPJK8nA7WwMXbmM4pG3VmN1bjQxciRCk-sXc/edit?usp=sharing

https://www.codementor.io/blog/php-interview-questions-sample-answers-du1080ext

https://www.php-fig.org/psr/psr-2/

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