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An Overview of Slim

A PHP micro-framework, Slim helps the developers write easy yet powerful APIs and web applications. This framework provides a fast and robust router that can map route callbacks to various HTTP requests and URIs. Because this framework supports pattern matching and parameters, developers can build concentric middleware around their Slim app. It supports PSR-7 HTTP message implementation which allows the developers to assess and manipulate HTTP message method, status, headers, URI, body, and cookies. We have the most extensive question back to help you respond to Slim framework interview questions.

Slim supports dependency injection (DI) so that developers have complete control of their external tools. Developers are free to use any Container-Interop.

Development History

Slim is one of the forerunners in the micro framework movement that began in 2013. It is inspired by an open source web application Sinatra, which is written in the Ruby language. A company called The New Media Campaigns has been sponsoring the R&D of the Slim framework. This information is usually asked in slim framework interview questions and answers for experienced professionals.

Latest Version

Slim 3.12.0 is the updated version, released in Jan 2019. Read more about recent versions if you are preparing for Slim framework interview questions and answers.

Advantages
  • 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

Slim Interview Questions and answers

Looking for a new job? Do not miss to read our Slim Interview Questions and answers. Whether you are a fresher or an experienced, these questions and answers that can help you to crack your interview.

A PHP micro-framework, Slim helps the developers write easy yet powerful APIs and web applications. This framework provides a fast and robust router that can map route callbacks to various HTTP requests and URIs.It supports PSR-7 HTTP message implementation which allows the developers to assess and manipulate HTTP message method, status, headers, URI, body, and cookies.

Uses of Slim Framework
  • A quick way to write powerful APIs and web applications
  • Allows you to map functions with URLs and methods
  • Allow you to modify requests and responses.
  • Developers have control over dependencies using Dependency Injection

Slim and Silex are different because Slim is a micro framework, while Silex is a full-stack framework.

Slim and Silex are similar because they both help developers build web applications with simple tools for receiving a request and delivering a response.

S.no Laravel, Symfony, and Zend Slim
1. Full-stack frameworks Micro framework
2. Consist of individual components that do different tasks necessary for complex web apps. A single component library that addresses the core of web apps.
3. Come with overhead Minimal overhead

Slim 3.12.0 released on 15 Jan 2019

composer require slim/slim "^3.0"

This information has been asked quite a few times recently in Slim framework interview questions.

Features of Slim Framework
  • 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
  • Web server with URL rewriting
  • PHP 5.5 or newer

In the Slim Framework, a hook is used to register a callback. Identified by string names, a hook is an instance at which the callables will get invoked as per the priority list assigned. It is possible to attach multiple callables to a single hook by using the hook() method.

A middleware is a kind of callable that accepts three types of arguments- PSR7 request object, a PSR7 response object, and next middleware. A middleware can do all types of functions with objects. However, a middleware MUST initiate next middleware and clear Response and Request objects as arguments.

If you are preparing for Slim interview, you can read our slim framework tutorial for in-depth knowledge.

In Slim Framework, dependency injection is a container for preparing, managing, and injecting application dependencies.

Each routing method in Slim Framework will accept a callback routine as the final argument. The last case may be any PHP callable.

By default, the framework allows three arguments - Request, Response, arguments.

An argument is a function that specifies the actions to be taken when a route is matched to a request. It includes values for the existing route’s specific placeholders.

Every HTTP request in the Slim Framework has a request method assigned. Here are some of the request methods:

  • GET
  • POST
  • PUT
  • DELETE
  • HEAD
  • PATCH
  • OPTIONS

Our most extensive Slim framework interview questions and answers can help developers crack any job interview.

$request->getAttribute('ip_address').
OR
$requestIP = $request->getServerParam('REMOTE_ADDR');

CORS or Cross-Origin Resource Sharing is a middleware that implements resource sharing across the origin. In Slim application, CORS is implemented through Access-Control-Allow-Origin header. The best way to enable CORS is by using the cors-middleware package.

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