What information should be included in the documentation block of a PHP function?

PHP documentation blocks are informative comments written in a function for other developers, containing information about the function, including: author, date, target, parameters, return values, exceptions, and usage examples.

Documentation Blocks for PHP Functions

PHP documentation blocks are comments that provide information about a function and its behavior. They are essential for writing high-quality code and making your code understandable to other developers.

The documentation block should contain the following information:

• Author: The author of the function.
• Date: The date the function was created or last modified.
• Objective: What is the purpose of the function.
• Parameters: Parameters accepted by the function, including type, name and description.
• Return value: The value returned by the function, including type and description.
• Exceptions: Any exception that the function may throw, including type and description.
• Usage example: A code example showing how the function is used.

Practical case

The following is an example of a PHP function that contains a documentation block:

/**
 * 计算两个数字的和。
 *
 * @param int $num1 第一个数字。
 * @param int $num2 第二个数字。
 * @return int 数字的和。
 * @throws InvalidArgumentException 如果任何参数不是数字。
 *
 * @example
 * ```php
 * $result = add(5, 10); // 输出: 15
 * ```
 */
function add($num1, $num2)
{
    if (!is_numeric($num1) || !is_numeric($num2)) {
        throw new InvalidArgumentException('参数必须是数字。');
    }

    return $num1 + $num2;
}

This documentation block contains all necessary information about the function Information, including author, date, target, parameters, return values, exceptions, and usage examples. This makes it easy for other developers to understand what the function does.

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