What are the best practices for writing PHP function documentation?

It is crucial to write detailed documentation of PHP functions using DocBlocks comments. DocBlocks should be clear and concise, containing function descriptions, parameters (@param), return values ​​(@return), exceptions (@throws), and type hints. Code examples help understand function usage, and following coding standards ensures consistent documentation. Example: Documentation for a function that determines whether a number is odd includes purpose, parameter types, and return value types, and uses type hints and code examples to improve reliability and understandability.

Best practices for PHP function documentation writing specifications

Writing function documentation is crucial because it helps within the team Members and external users understand the usage and functionality of your code. The following are some best practices for writing PHP function documentation:

1. Use comment blocks

DocBlocks are comment blocks specifically used by PHP to comment functions. It uses a specific syntax that allows IDEs and documentation tools to quickly parse and generate documentation.

/**
 * 计算两个数字的和。
 *
 * @param int $a 第一个数字。
 * @param int $b 第二个数字。
 *
 * @return int 两个数字的和。
 */
function add(int $a, int $b): int
{
    return $a + $b;
}

2. Document format

DocBlocks should follow a clear and concise format, including the following parts:

• Description : Briefly describe the purpose and function of the function.
• @param: List the parameters of the function and their types and descriptions.
• @return: Specify the return value type and description of the function.
• @throws: List any exceptions and related descriptions that the function may throw.

3. Use type hints

Using type hints in DocBlocks helps to check the types of parameters and return values ​​at runtime. This can help catch errors and improve the reliability of your code.

4. Use code examples

Including code examples in DocBlocks can help users quickly understand the use of functions.

5. Follow coding standards

Follow clear coding standards to ensure the unity and clarity of the document. This includes using consistent indentation, line breaks, and syntax rules.

Practical case

Consider the following function:

/**
 * 判断一个数字是否是奇数。
 *
 * @param int $num 一个数字。
 *
 * @return bool True 如果数字是奇数，否则为 False。
 */
function is_odd(int $num): bool
{
    return $num % 2 != 0;
}

This DocBlock describes the function's purpose, parameter type, return value type and description. It also uses type hints to ensure that parameters are of the correct type and provides a code example.

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