laravel running process

Laravel is a popular PHP framework that provides many convenient functions and operations, allowing developers to create web applications more efficiently. In this article, we will take an in-depth look at the running process of Laravel.

1. Laravel’s request processing process

Laravel’s request processing process can be divided into the following steps:

1.1. User’s request
The user's request is sent to the PHP interpreter through a web server such as Apache or Nginx.

1.2. Entry file
After the request reaches the server, it will be processed by the entry file index.php (or other specified entry file). Usually, Laravel's entry file is public/index.php.

1.3. HTTP core
The entry file forwards the request to Laravel's HTTP core. The HTTP core is the core of Laravel and is responsible for handling all HTTP requests. After the HTTP kernel is started, it will register all core services and start middleware.

1.4. Middleware
Middleware is a very important concept that allows programmers to perform some operations before and after the request reaches the application. Middleware can be used for operations such as authentication, logging, and caching.

1.5. Routing
After middleware processing, the request is routed to the corresponding controller or closure. A route defines the URI of the request and the controller or closure that handles the request.

1.6. Controller
The controller is the C (controller) in the MVC structure, responsible for processing requests and returning responses to the user. The controller can call the model to query the database, execute business logic, etc.

1.7. View
The controller usually transfers data to the view, which is responsible for rendering the data as HTML output. Laravel supports the Blade template engine, making views more convenient and easier to manage.

1.8. Response
Finally, the controller returns an HTTP response to the user. Responses can be in HTML, JSON or other formats.

2. Laravel's service container

Laravel's service container is a very important concept, it is the basis of the entire framework. Service containers provide a flexible, extensible framework that allows developers to implement object-oriented programming.

The main function of the service container is to manage class dependencies and provide a decoupled way so that we can better organize and manage code.

3. Laravel's dependency injection

Laravel's dependency injection is part of the service container, which allows objects to be more flexibly decoupled. Dependency injection is a mechanism for passing dependencies through constructors, method calls, or property injection.

In Laravel, dependency injection usually uses constructor injection. For example, if we need to use a model in a controller, dependency injection can be done by passing the model instance to the constructor of the controller.

4. Laravel’s middleware

In Laravel, middleware is a very common concept. Middleware can perform operations such as authentication, logging, caching, etc. before and after the request reaches the application.

Laravel middleware is usually implemented through a class, which defines the operation to be performed by the middleware. Middleware can use global middleware, routing middleware, group middleware, etc.

5. Laravel's model

In Laravel, the model represents the table in the database. The model is responsible for handling all operations related to the table, such as querying, creating, updating, and deleting.

Laravel's model usually inherits from the Eloquent base class, which provides a very convenient ORM (object relational mapping) function that allows us to operate the database in an object-oriented manner.

6. Laravel’s ORM

In Laravel, ORM (Object Relational Mapping) is implemented through Eloquent. Eloquent provides simple and direct operations to facilitate us to store, update, delete and query data.

ORM provides common CRUD (create, read, update and delete) operations and supports associations between models. ORM allows us to handle database operations in an object-oriented manner, improving the maintainability and readability of the code.

7. Laravel’s Blade Template Engine

Laravel’s Blade is a popular template engine that provides a simple yet powerful way to render data into HTML output .

Blade supports common template functions, such as layout, conditional statements, loops, variables and content placeholders, etc. Blade's template syntax is very intuitive and easy to learn, and can help us build web applications more efficiently.

Summary

This article introduces the running process of Laravel, including request processing process, service container, dependency injection, middleware, model, ORM and Blade template engine, etc. Laravel is a very popular PHP framework and has very powerful functions and operations. By deeply studying Laravel's operating process, we can better understand its inner workings and enhance our development skills and abilities.

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