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Phalcon Interview Questions

Phalcon Interview Questions: Phalcon is a PHP web framework based on the model–view–controller (MVC) pattern.
Q:- What is Phalcon?

Phalcon is a web application framework, written in C, PHP

Phalcon: High Performance PHP Framework

Phalcon is the first framework that implements ORM in C-programming language.

Q:- What is the most important features of Phalcon?
  1. Low Overhead: Low memory consumption and CPU compared to traditional frameworks
  2. MVC & HMVC Pattern: Modules, components, models, views and controllers
  3. Dependency Injection: Dependency Injection and Location of services and it's itself a container for them
  4. Support for Rest: In this case, you can use either a micro or full stack application to meet your goal. In addition, a powerful set of HTTP helpers
  5. Autoloader: Provides the autoloading mechanism of PHP classes following PSR-4.
  6. Router: Phalcon\Mvc\Router provides advanced routing capabilities.
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Q:- What is Dependency Injection in Phalcon?

Phalcon's Dependency injection initializes or define services once – and use them virtually anywhere throughout the application

Q:- What is Loader & Lazy Initialization in Phalcon?
Loader:

Loader is a class found under Phalcon\Loader directory.

Phalcon\Loader allows you to load project classes automatically, based on some predefined rules. Since this component is written in C, it provides the lowest overhead in reading and interpreting external PHP files.

Lazy Initialization:

In Loader if a class is added according to its need in program, performance is increased as only specific file is included. This technique is known as lazy initialization.

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Q:- What is PHQL in Phalcon?

PHQL stands for - Phalcon Query Language.

PHQL (Phalcon Query Language) allows user to implement query language similar to SQL query language.

PHQL is implemented as a parser which connects to RDBMS.

Q:- What is zephir in Phalcon?

Zephir stands for - Ze(nd Engine) Ph(p) I(nt)r(mediate).

Zephir is an open source, high-level language designed to ease the creation and maintainability of extensions for PHP.

Q:- Which template engine is used in Phalcon?

Volt templating Engine.

Volt provides Phalcon fast execution as it is very fast and designer friendly templating language written in C for PHP.

Volt is inspired by Jinja and written by Armin Ronacher.

Q:- How can you inject a services into a Volt Template?

If a service container (DI) is available for Volt, you can use the services by only accessing the name of the service in the template.

{# Inject the 'flash' service #}
{{ flash.output() }}
{# Inject the 'security' service #}
Q:- What is ODM in Phalcon?

ODM stands for Object Document Mapper

It offers a CRUD functionality, events and validations among other services in Phalcon.

Q:- How can we increase the CSRF timeout in Phalcon?

Phalcon CSRF tokens use sessions, so if you increase your session timeout it will automatically increase the token time as well.

Q:- How to pass data from the controller to view in Phalcon?

By using - setVar() method

$this->view->setVar("name", "Phalcon Interview Questions");
Q:- How many database engines supported by Phalcon?

Phalcon uses PDO_ to connect to databases.

Following are the some database engines supported by Phalcon:

  1. Phalcon\Db\Adapter\Pdo\Mysql : Mysql
  2. Phalcon\Db\Adapter\Pdo\Postgresql : Postgresql
  3. Phalcon\Db\Adapter\Pdo\Sqlite : SQLite
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