PHPDoc function for PHP functions

PHPDoc is a document comment tool widely used by PHP developers. It provides users with a simple and convenient way to record function, parameter and return value information. In PHP development, functions are one of the commonly used code organization forms, and the function comments provided by PHPDoc can greatly improve the readability and maintainability of the code. In this article, we will focus on the PHPDoc function of PHP functions and implement annotations for a sample function.

1. Introduction to PHPDoc

PHPDoc is a comment style used to describe various functions, classes, variables and constants in PHP code. Using PHPDoc comments can better organize the code and produce excellent API documentation, making it easier for other developers to understand what the code does and how to use it.

In PHPDoc, the comment text should be preceded by a pair of slashes (/) and an asterisk (*) before the function body, as shown below:

/**
 * My Function Name
 *
 * This function does something awesome with parameters
 *
 * @param string $param1 Parameter number 1
 * @param int $param2 Parameter number 2
 * @return bool Returns true or false
 */

The comment contains Information about the function's name, description, parameters, and return value. This is very useful in multi-person collaborative development because it provides other developers with detailed information about the function, making it easier for them to understand the implementation details of the code.

2. PHPDoc comments for PHP functions

In PHP, a function is a set of logically related code blocks that specify tasks and can be referenced and called multiple times in the program. Each function should have a comment describing its functionality and inputs and outputs, as mentioned earlier. The following is a sample function and its corresponding PHPDoc comment:

/**
 * 计算两个数的和
 *
 * @param float $a 第一个加数
 * @param float $b 第二个加数
 * @return float 返回两个数的和
 */
function add($a, $b) {
    return $a + $b;
}

In the comment, the name, function, and information about the parameters and return value are described. Parameters are declared using the @param tag, and return values ​​are declared using the @return tag. This allows other developers to easily view the usage and return value of the function, making it easier to understand the function and usage of the function.

3. Other tags of PHPDoc

In addition to the @param and @return tags mentioned above, PHPDoc also provides some other tags, which are usually used to describe elements in the document. , for example:

• @access: Specify the level of code access (private, protected, public).
• @deprecated: Specifies whether the element has been deprecated and developers are advised not to use it in new code.
• @static: Specifies whether the element is static, used to distinguish instance methods and static methods.
• @throws: Specifies the types of exceptions that may be thrown by the element.
• @var: Specify the type and description of the variable, mainly used for class member variables and global variables.

4. A complete example

Let’s look at a complete example of PHPDoc annotation. This example is a function that calculates the area of ​​a circle:

/**
 * 计算圆的面积
 *
 * @param float $radius 圆的半径
 * @return float 返回圆的面积
 * @throws InvalidArgumentException 如果参数不是数字
 */
function calculateCircleArea($radius) {
    if (!is_numeric($radius)) {
        throw new InvalidArgumentException('参数必须是数字');
    }
    return pi() * pow($radius, 2);
}

In In the above comment, the @param mark is used to indicate that the function only accepts a radius parameter of type floating point number. Additionally, the @return tag indicates that the function returns a floating-point value representing the area of ​​the circle. In addition, the @throws tag is used to indicate that the function will throw a specific exception type when the passed parameter is not a number.

5. Summary

In PHP development, functions are a very important and frequently used code organization form. Writing descriptive PHPDoc comments for functions can make your code more readable, maintainable, and useful. Understanding common comment tags and formats can make it easier for developers to understand and use code. In actual development, we can write some tools to use annotations to generate API documentation and improve the readability and maintainability of the code.

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