PSR2 and PSR4 specifications standardize requirements for team cooperation development

PSR2 and PSR4 specifications have standardized requirements for teamwork development and require specific code examples

Introduction:
In the process of teamwork development, code specifications are the most important important. It can improve the readability and maintainability of code, and ensure code consistency when multiple people collaborate on development. The PSR2 and PSR4 specifications in the PSR (PHP Standard Recommendations, php standard recommendations) proposed by PHP-FIG (PHP-Framework Interoperability Group, PHP Framework Interoperability Group) provide us with a unified set of standards for Standardize the writing and directory structure of PHP code. This article will introduce the PSR2 and PSR4 specifications in detail and provide corresponding code examples.

PSR2 specification:
PSR2 specification mainly focuses on code writing specifications, including naming conventions, code indentation, code style, etc. Here are some common specification requirements:

1. Code indentation: Use 4 spaces as an indentation level instead of tabs. This ensures code consistency under different editors.
2. Naming convention: Use camelCase for variable, function and method names. Class names should use PascalCase.
3. The number of characters per line of code should not exceed 80 characters.
4. Code blocks should be separated by blank lines to improve readability.

The following is a code example that complies with the PSR2 specification:

<?php

use FooBar;

class MyClass
{
    private $property;

    public function __construct()
    {
        $this->property = 'some value';
    }

    public function getProperty()
    {
        return $this->property;
    }
}

$myObject = new MyClass();
echo $myObject->getProperty();

PSR4 specification:
The PSR4 specification mainly focuses on automatic loading of code and namespace specification. It defines a standard directory structure and file naming convention to achieve automatic loading. Here are some common specification requirements:

1. Namespace: Use namespaces to organize code. Namespaces should correspond to directory structures to improve code readability and organization.
2. Automatic loading: Use the Composer tool to manage dependencies and automatic loading. Through Composer's PSR-4 automatic loading mechanism, the corresponding class file can be directly loaded according to the namespace.

The following is an example of a directory structure that conforms to the PSR4 specification:

├── src/
│   └── Foo/
│       └── Bar/
│           ├── Baz.php
│           └── Quux.php
└── vendor/
    └── autoload.php

The namespace of the Baz.php file should be namespace FooBar;, and Quux.php The namespace of the file should be namespace FooBar;.

Using the Composer tool, you only need to add the following configuration in the composer.json file to achieve automatic loading:

{
    "autoload": {
        "psr-4": {
            "Foo\Bar\": "src/Foo/Bar/"
        }
    }
}

Then run the composer dumpautoload command, Composer will automatically Generate an autoload.php file, which scans the directory structure and generates the autoloading mapping of the class.

Conclusion:
PSR2 and PSR4 specifications provide a unified set of specifications and standards for team cooperation and development, which can ensure the consistency and readability of the code. By following these specifications, team members can better collaborate on development and improve the maintainability and scalability of the code. Therefore, before starting teamwork development, we should fully understand and comply with the PSR2 and PSR4 specifications to ensure the quality and efficiency of the project.

In this article, we detail the requirements of the PSR2 and PSR4 specifications and provide corresponding code examples. It is hoped that through these examples, the PSR2 and PSR4 specifications can be better understood and applied, thereby improving the efficiency and quality of team development.

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