Code merging and refactoring practices following PSR2 and PSR4 specifications

Code merging and refactoring practices that follow PSR2 and PSR4 specifications require specific code examples

Introduction:
In software development, code merging and refactoring It is a very common operation. Code merging refers to merging multiple scattered code fragments into one file or module to improve the readability and maintainability of the code. Code refactoring refers to improving existing code to make it more efficient, scalable, and easy to understand. This article explains how to follow PSR2 and PSR4 specifications when merging and refactoring code, with specific code examples.

1. Follow the PSR2 specification for code merging:

1. Standard naming convention: use camel case naming method to name class names, method names and variable names, and use meaningful name. Avoid abbreviations and meaningless names.

   // 不符合规范的示例
   function calc_sum($numbers) {}
   
   // 符合规范的示例
   function calculateSum($numbers) {}

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2. Indentation and Spaces: Use four spaces for indentation and add spaces before and after operators in your code. In function calls and array indexes, place the comma at the end of the line and add a space after the comma.

   // 不符合规范的示例
   function calculateSum($numbers){
   }
   
   // 符合规范的示例
   function calculateSum($numbers) {
   }

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3. Line length limit: The length of each line of code should be controlled within 80 characters, and appropriate line breaks should be used to split overly long code into multiple lines.

   // 不符合规范的示例
   function calculateVeryLongAndComplicatedSum($numbers, $multipliers, $constants, $configurations){}
   
   // 符合规范的示例
   function calculateVeryLongAndComplicatedSum(
    $numbers, $multipliers, $constants, $configurations
   ) {}

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2. Follow the PSR4 specification for code refactoring:

1. Use namespaces: Use namespaces to organize code according to functions or fields and avoid naming Conflicts and code confusion.

// 不符合规范的示例
include 'functions.php';
include 'helpers.php';
include 'models/User.php';

$user = new User();

// 符合规范的示例
use AppHelpers;
use AppModelsUser;

$user = new User();

2. Use automatic loading: According to the PSR4 specification, use tools such as Composer to automatically load class files to avoid manual include and require.

// 不符合规范的示例
require 'app/helpers.php';
require 'app/models/User.php';

use AppModelsUser;

$user = new User();

// 符合规范的示例
use AppModelsUser;

$user = new User();

3. Code reuse and abstraction: abstract based on the common functions of the code and extract reusable code fragments. For example, extract the same code logic into a separate function or class.

// 不符合规范的示例
function calculateSum($numbers) {
    $sum = 0;
    foreach ($numbers as $number) {
        $sum += $number;
    }
    return $sum;
}

function calculateAverage($numbers) {
    $sum = 0;
    foreach ($numbers as $number) {
        $sum += $number;
    }
    return $sum / count($numbers);
}

// 符合规范的示例
function calculateSum($numbers) {
    return array_sum($numbers);
}

function calculateAverage($numbers) {
    return array_sum($numbers) / count($numbers);
}

Summary:
Code merging and refactoring practices that follow the PSR2 and PSR4 specifications can improve the readability, maintainability and scalability of the code. By standardizing naming conventions, use of indents and spaces, line length limits, etc., you can make your code more standardized and easier to understand. At the same time, by using technologies such as namespaces, automatic loading, and code reuse, the code can be organized separately and the scalability and reusability of the code can be improved. In actual development, we should continue to learn and follow these specifications to improve code quality and development efficiency.

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