How to annotate PHP functions with documentation comments?

PHP documentation comments are used to annotate functions and contain the following required fields: description, parameters (@param), and return value (@return). Optional fields include: exceptions (@throws), introduction version (@since), and usage examples (@example). Use the PHPDocumentor tool to generate HTML documentation to view annotated functions.

How to use documentation comments to annotate PHP functions

Documentation comments are used to record PHP code such as functions, classes, and methods. Special comment format for elements. They help make code more readable and maintainable, making it easier for developers to understand how to use and modify the code.

Documentation comment format

PHP documentation comments are in the following format:

/**
 * 文档注释内容
 */

Required fields

Documentation Comments should contain at least the following required fields:

• Description: A brief description of the function and what it does.
• @param: Specify the parameters accepted by the function and their types.
• @return: Specify the value returned by the function and its type.

Optional fields

In addition to the required fields, documentation comments can also contain the following optional fields:

• @throws: Exceptions that may be thrown by the specified function.
• @since: Specifies the PHP version introduced by the function.
• @example: Provides examples of function usage.

Practical case

Here's how to add a documentation comment to a simple PHP function that calculates the sum of two numbers:

/**
 * 计算两个数字之和
 *
 * @param float $num1 第一个数字
 * @param float $num2 第二个数字
 * @return float 两个数字之和
 */
function add($num1, $num2)
{
    return $num1 + $num2;
}

Generate Documentation

PHPDocumentor is a popular tool that can be used to generate HTML documentation from PHP documentation comments. To generate documentation, follow these steps:

1. Install PHPDocumentor.
2. Run the phpdoc command.
3. Open the generated HTML file to view the documented function.

By using documentation comments, you can easily document your PHP code and improve its maintainability.

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