Share and apply code layout rules from PHP code specifications

Title: Code layout rules and application examples in PHP code specifications

Introduction:
When developing PHP applications, good code layout specifications can improve Code readability and maintainability. This article will share some common PHP code layout rules and provide corresponding sample code to help readers better understand and apply these rules.

1. File structure rules:
1.1 File naming:

• The file name should use lowercase letters;
• The file name should be consistent with the class name and interface name , Trait names are consistent;
• file names should use dashes or underscores as word separators.

Example:

// 文件名：my-class.php
class MyClass {
    // ...
}

1.2 File extension:

• PHP files should have the extension ".php".

1.3 File encoding:

• Files should use UTF-8 encoding.

2. Code indentation and alignment rules:
2.1 Code indentation:

• Use 4 spaces as indentation (no tabs);
• Avoid using excessive indentation.

Example:

<?php

function myFunction(){
    if(condition1){
        // do something
    }
    else{
        // do something else
    }
}

2.2 Alignment:

• In multi-line statements, use alignment to improve code readability.

Example:

<?php

$query = "SELECT *
          FROM my_table
          WHERE condition1
            AND condition2";

3. Naming rules:
3.1 Naming variables and functions:

• Variable and function names should use lowercase letters and Underline nomenclature;
• Variable names should clearly express the meaning of the variable.

Example:

<?php

$first_name = "John";

function calculate_sum($array){
    // ...
}

3.2 Class, interface and Trait naming:

• Class, interface and Trait names should use big camel case naming;
• The class name should indicate the specific meaning of the class.

Example:

<?php

class MyClass {
    // ...
}

interface MyInterface {
    // ...
}

trait MyTrait {
    // ...
}

4. Other rules:
4.1 Line length limit:

• One line of code should not exceed 80 characters;
• If a line of code exceeds 80 characters, it should be wrapped appropriately to improve the readability of the code.

Example:

<?php

$long_string = "This is a long string that exceeds the 80-character limit. ".
               "We should break it into multiple lines for better readability.";

4.2 Blank lines:

• Use blank lines where there are obvious logical separations to improve the readability of the code.

Example:

<?php

function myFunction(){
    // do something
    
    // a blank line
    
    // do something else
}

Summary:
By following the code layout rules in the PHP code specification, we can write PHP code with good readability and maintainability . Reasonable file structure, clear naming rules, unified code indentation and alignment are all important factors to improve code quality. I hope that sharing this article can help you better apply the code layout rules in PHP code specifications and improve the efficiency and quality of writing PHP applications.

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