Code comments in PHP

Code comments are text reminders that programmers add when writing code to make it easier for themselves and other programmers to read and understand the code. In PHP, code comments are indispensable. This article will introduce in detail the types, specifications and uses of code comments in PHP.

1. Types of code comments in PHP

In PHP, there are three types of comments: single-line comments, multi-line comments and documentation comments.

1. Single-line comments

Single-line comments start with a double slash "//" and end at the end of the line. For example:

// 这是一个单行注释

2. Multi-line comments

Multi-line comments start with "/" and end with "/". Can span multiple lines. For example:

/*
这是一个多行注释
这是第二行
*/

3. Documentation comments

Documentation comments are used to describe the purpose, parameters, return values ​​and other information of functions, classes, methods, etc. Documentation comments start with "/*" and end with "/". For example:

/**
 * 函数说明
 * 
 * @param int $a 参数1
 * @param string $b 参数2
 * @return array 返回结果
 */
function test($a, $b) {
    //...
}

2. Code comment specifications in PHP

In PHP, there are some comment specifications that need to be followed to facilitate other programmers to understand the code.

1. Single-line comments

Single-line comments should start with a double slash "//", followed by a space before the comment content. For example:

// 这是一个单行注释

2. Multi-line comments

Multi-line comments should start with "/" and then add an asterisk "#" before each comment line ##", and finally ends with "*/". For example:

/*
 * 这是一个多行注释
 * 这是第二行注释
 */

Documentation comments

The documentation comment format should contain information such as the function's description, parameters, and return values. For example:

/**
 * 函数说明
 * 
 * @param int $a 参数1
 * @param string $b 参数2
 * @return array 返回结果
 */
function test($a, $b) {
    //...
}

3. The purpose of code comments in PHP

The code comments in PHP have the following main purposes:

Help yourself and other programmers understand the code

Code comments can make it easier for programmers to understand the code, especially when dealing with complex logic or design. Comments can provide more detailed explanations and clarify confusion among programmers.

Facilitates code modification

When the code needs to be modified, comments can make it easier for programmers to understand the structure and function of the code. If you have added appropriate comments, you will be more careful when modifying the code to avoid affecting other code.

Display function and class information

Documentation comments can provide information about functions, classes, methods, etc., including parameters and return values. This information helps other programmers accurately use a function or call a method in a class.

Meet coding standards or development team regulations

Some development teams have annotated coding standards or other development standards. Following these conventions creates consistency in coding, making the code more readable and maintainable.

In short, code comments are an important part of writing high-quality PHP code. Comments not only help you and other programmers understand the code, they also improve the readability and maintainability of the code. Therefore, comments are indispensable when writing PHP code.

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