wordpress 插件中的类自动加载器 [英] Class autoloader in wordpress plugin

问题描述

我想编写一个类自动加载器以在 wordpress 插件中使用.此插件将安装在多个站点上，我希望尽量减少与其他插件冲突的机会.

I want to write a class autoloader to use in a wordpress plugin. This plugin will be installed on multiple sites, and i want to minimize the chance of conflicts with other plugins.

自动加载器将是这样的:

The autoloader will be something like this:

function __autoload($name) {
    //some code here
}

我的主要问题是，如果另一个类也使用这样的函数会怎样?我认为它一定会产生问题.避免这种情况的最佳方法是什么?

My main issue is, what happens if another class also uses a function like this? I think it will be bound to give problems. What would be the best way to avoid something like that?

我试图不使用命名空间，因此代码也适用于以前版本的 php.

I am trying to not use namespaces so the code will also work on previous versions of php.

推荐答案

使用一些像这样的实现.

Use some implementation like this one.

function TR_Autoloader($className)
{
    $assetList = array(
        get_stylesheet_directory() . '/vendor/log4php/Logger.php',
        // added to fix woocommerce wp_email class not found issue
        WP_PLUGIN_DIR . '/woocommerce/includes/libraries/class-emogrifier.php'
        // add more paths if needed.
    );

// normalized classes first.
    $path = get_stylesheet_directory() . '/classes/class-';
    $fullPath = $path . $className . '.php';

    if (file_exists($fullPath)) {
        include_once $fullPath;
    }

    if (class_exists($className)) {
        return;
    } else {  // read the rest of the asset locations.
        foreach ($assetList as $currentAsset) {
            if (is_dir($currentAsset)) {
               foreach (new DirectoryIterator($currentAsset) as $currentFile) 
{
                    if (!($currentFile->isDot() || ($currentFile->getExtension() <> "php")))
                        require_once $currentAsset . $currentFile->getFilename();
                }
            } elseif (is_file($currentAsset)) {
                require_once $currentAsset;
            }

        }
    }
}

spl_autoload_register('TR_Autoloader');

基本上这个自动加载器已注册并具有以下功能:

Basically this autoloader is registered and has the following features:

• 如果不遵循包含类 (assetList) 的文件位置的特定模式，您可以添加特定的类文件.
• 您可以将整个目录添加到您的课程搜索中.
• 如果类已经定义好了，你可以添加更多的逻辑来处理它.
• 您可以在代码中使用条件类定义，然后在类加载器中覆盖类定义.

现在如果你想用OO​​P的方式来做，只需在类中添加自动加载器功能.(即:myAutoloaderClass)并从构造函数调用它.然后只需在您的functions.php中添加一行

Now if you want want to do it in OOP way, just add the autoloader function inside a class. (ie: myAutoloaderClass) and call it from the constructor. then simply add one line inside your functions.php

new myAutoloaderClass(); 

并在构造函数中添加

function __construct{
   spl_autoload_register('TR_Autoloader' , array($this,'TR_Autoloader'));
}

希望这会有所帮助.人力资源

Hope this helps. HR

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