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Slim Framework Interview Questions and Answers - A PHP micro Framework

What Is Slim framework?
Slim Framework is a PHP micro framework that helps PHP developers to write quickly and easily a powerful web applications and APIs.

How Is Slim framework different from other frameworks like Laravel, Symfony or Zend?
Slim framework is a micro framework while Laravel/Symfony/Zend framework is a full-stack framework.

Is Slim framework similar to Symfony’s Silex? How do they differ?
  • Silex is micro-framework based on the Symfony Components.
  • Silex is not based on the PSR-7 (HTTP message interfaces) standard
  • Silex is in maintenance mode. Ends of life 1 is set to June 2018.
What Are the features of Slim Framework?
The following features of Slim Framework are:
  • Includes great routes - Route middleware, Route redirect, and Standard HTTP methods
  • Easy to solve and fix the errors
  • AES-256 encryption secures the data and stores in cookies
  • Possible to render external PHP files using template rendering

What Is Router in Slim framework?
The Slim Framework’s router is built on top of the nikic/fastroute component, and it is remarkably fast and stable.

How to create routes in Slim framework?
You can define application routes using proxy methods on the \Slim\App instance. The Slim Framework provides methods for the most popular HTTP methods.

What Is GET Route?
In the GET Route, we can add a route that handles only GET HTTP requests with the Slim application’s GET() method.

Example for GET Route:
$app = new \Slim\App();
$app->get('/customers/{id}', function ($request, $response, $args) {
    // Show customers identified by $args['id']

What Is POST Route?
In the POST Route, we can add a route that handles only POST HTTP requests with the Slim application’s POST() method.

Example for POST Route:
$app = new \Slim\App();
$app->post('/customers', function ($request, $response, $args) {
    // Create new customers

What Is PUT Route?
In the PUT Route, we can add a route that handles only PUT HTTP requests with the Slim application’s PUT() method.

Example for PUT Route:
$app = new \Slim\App();
$app->put('/customers/{id}', function ($request, $response, $args) {
    // Update customers identified by $args['id']

What Is DELETE Route?
In the DELETE Route, we can add a route that handles only DELETE HTTP requests with the Slim application’s DELETE() method.

Example for DELETE Route:
$app = new \Slim\App();
$app->delete('/customers/{id}', function ($request, $response, $args) {
    // Delete customers identified by $args['id']

What Is OPTIONS Route?
In the OPTIONS Route, we can add a route that handles only OPTIONS HTTP requests with the Slim application’s OPTIONS() method.

Example for OPTIONS Route:
$app = new \Slim\App();
$app->options('/customers/{id}', function ($request, $response, $args) {
    // Return response headers

What Is PATCH Route?
In the PATCH Route, we can add a route that handles only PATCH HTTP requests with the Slim application’s PATCH() method.

Example for PATCH Route:
$app = new \Slim\App();
$app->patch('/customers/{id}', function ($request, $response, $args) {
    // Apply changes to customers identified by $args['id']

What Is Any Route?
In the Any Route, we can add a route that handles only Any HTTP requests with the Slim application’s Any() method.

Example for Any Route:
$app = new \Slim\App();
$app->any('/customers/[{id}]', function ($request, $response, $args) {
    // Apply changes to customers identified by $args['id'] if specified.
    // To check which method is used: $request->getMethod();

How to Install Slim?
System Requirements:
1.      Web server with URL rewriting
2.      PHP 5.5 or newer
We recommend you install Slim with Composer using link -

How to Install Composer?
If you don't have Composer, install by following the instructions on their download page.

List some Environment Variables of Slim Framework?
There are no any specific environment variables in Slim Framework.

What Is Dependency Injection?
Dependency Injection is a powerful pattern for managing code dependencies. DI is a way to create objects that depend upon other objects.

Angular has its own DI framework pattern, and you really can't build an Angular application without Dependency injection (DI).
By Anil Singh | Rating of this article (*****)

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