Example demonstration and usage guide of PSR2 and PSR4 specifications in Phalcon framework

Example demonstration and usage guide of PSR2 and PSR4 specifications in Phalcon framework

Introduction:
With the popularity and development of open source software, code standardization has become A very important topic. Code specifications can improve the readability and maintainability of code, making it easier for team members to collaborate. PHP-FIG has developed a series of PSR (PHP Standards Recommendations) specifications, the most commonly used of which are PSR2 and PSR4. This article will take the Phalcon framework as an example to demonstrate and guide how to use the PSR2 and PSR4 specifications in the Phalcon framework.

Part One: PSR2 Specification

The PSR2 specification mainly focuses on the style and format of the code, making the code more readable and consistent.

1. File naming:

   • The file name should use uppercase camel case and be suffixed with .php. For example, UserController.php.

2. Code indentation and alignment:

   • Use four spaces for code indentation.
   • All code should consist entirely of spaces, not tabs.

3. Naming and declaration of classes:

   • Class names should use uppercase camel case nomenclature.
   • The namespace declaration in the class file should match the file path.
   • The opening brace of the class { should be on its own line and aligned vertically with the class name.
   • The closing brace of the class } should be on a separate line.

4. Naming and declaration of functions and methods:

   • Function and method names should use lowercase camel case nomenclature.
   • Leave a space after the brackets for functions and methods.
   • The opening and closing braces of the method {} are vertically aligned with the method name.

The following is a sample code that follows the PSR2 specification:

<?php

namespace AppControllers;

class UserController
{
    public function indexAction()
    {
        // 方法体代码
    }

    public function createAction()
    {
        // 方法体代码
    }
}

Part 2: PSR4 specification

The PSR4 specification mainly focuses on the automatic loading mechanism , so that application files can be automatically loaded in a standardized manner.

1. Mapping relationship between namespace and class:

   • There is a one-to-one correspondence between the top-level path of the namespace and the file system folder.
   • The class name must include its complete namespace path.

2. Storage location of class files:

   • Class files are stored in the folder corresponding to the namespace.
   • The class file name must exactly match the class name, including case.

The following is a sample code that follows the PSR4 specification:

<?php

use PhalconLoader;

$loader = new Loader();

$loader->registerNamespaces([
    'AppControllers' => 'app/controllers',
    'AppModels'      => 'app/models',
]);

$loader->register();

In the above code, we registered the naming through Phalcon’s Loader class The spaces AppControllers and AppModels match the paths app/controllers and app/models in the file system. In this way, when using the Phalcon framework, class files under these namespaces will be automatically loaded.

Conclusion:
This article introduces the sample demonstration and usage guide of PSR2 and PSR4 specifications in the Phalcon framework. By following these conventions, we can make our code more consistent, readable, and maintainable, and improve team members' collaboration efficiency. In actual development, please choose the appropriate code specification based on the specific situation, and ensure that the entire team strictly follows the specification. This enables the creation of high-quality, easy-to-maintain Phalcon applications.

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