How to create and document a PHP function library?

Creating a PHP function library involves defining functions and organizing them into namespaces. Documentation Use DocBlocks to add comments and then use tools to convert them into accessible documents. For example, a library for calculating the area of ​​a geometric shape contains functions for calculating the area of ​​a circle and a square, and uses DocBlocks to record the details of each function, which can be used to generate detailed documentation through the tool.

How to create and document a PHP function library

Introduction

Function libraries are code containers that group related functions together for reuse in different programs and scripts. This article will guide you on how to create and document your own function library using PHP.

Create function library

Step 1: Create a new PHP file

Create a new PHP file, for example myFunctions.php.

Step 2: Define Functions

In the file, define the functions you wish to include in the function library. For example:

function sum($a, $b) {
  return $a + $b;
}

function multiply($a, $b) {
  return $a * $b;
}

Step 3: Use the namespace declaration

to define a namespace for your function library to prevent conflicts with other code Function name conflict. For example:

namespace MyNamespace;

Documented function library

Step 1: Use DocBlocks

DocBlocks Yes Special block comments for adding documentation comments to PHP functions. Add a DocBlock in front of each function that contains details about the function's functionality, parameters, return value, and any other relevant information.

Example DocBlock:

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

Step 2: Convert DocBlocks to Documents

Various tools can be used (such as PhpDoc , Doxygen) convert DocBlocks into interactive documents that can be easily accessed by developers.

Practical case

Suppose you have a function library that calculates the area of ​​a geometric shape:

namespace Geometry;

/**
 * 计算圆的面积。
 *
 * @param float $radius 半径
 * @return float 面积
 */
function circleArea($radius) {
  return pi() * $radius ** 2;
}

/**
 * 计算正方形的面积。
 *
 * @param float $side 边长
 * @return float 面积
 */
function squareArea($side) {
  return $side ** 2;
}

By using DocBlocks and PhpDoc, you can generate a detailed Documentation that contains a description, parameters, return values, and example usage for each function.

Conclusion

This article provides a step-by-step guide to creating and documenting a PHP function library. By following these steps, you can easily organize and document your code so that it is easy for others to use and understand.

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