PSR-4自动加载如何在自定义库的composer中工作? [英] How does PSR-4 autoloading work in composer for custom libraries?

问题描述

基于对PHP中名称空间的工作原理的理解，我使用以下目录结构:

I use the following directory structure based on my understanding of how namespaces in PHP work:

project_root
    app/
    |    lib/
    |    |    MyCompany/
    |    |    |    Utility/
    |    |    |    |    Logger.php
    |    |    |    Core/
    |    |    |    |    User.php
vendor/
    composer/
    symfony/
    guzzle/
bootstrap.php
composer.json

根据PSR-4规范，完全限定的类名称具有以下形式:

According to the PSR-4 specification, a fully qualified class name has the following form:

\<NamespaceName>(\<SubNamespaceNames>)*\<ClassName>

问题1:

根据我上面的目录结构，下面的假设正确吗?

From my directory structure above, is the assumption below correct?

• NamespaceName = MyCompany
• SubNamespaceNames =实用工具|核心
• ClassName =记录器|用户

问题2:

如果我的bootstrap.php文件包含以下内容:

If my bootstrap.php file contains the following:

<?php
require 'vendor/autoload.php';

我将如何配置作曲家的自动加载" 部分. json以自动加载MyCompany目录中的类?这样我就可以在bootstrap.php中创建Logger的实例

How would I configure the 'autoload' section of composer.json to autoload the classes in the MyCompany directory? Such that I would be able to create an instance of Logger in bootstrap.php

推荐答案

从您链接的文档中摘录:

Taken from the documentation you linked:

{
    "autoload": {
        "psr-4": {
            "MyCompany\\": "app/lib/MyCompany/",
        }
    }
}

这很容易解释，它只是告诉自动加载器app/lib/MyCompany是MyCompany\名称空间的根.

This is pretty self explanatory, it simply tells the autoloader that app/lib/MyCompany is the root for the MyCompany\ namespace.

然后您就可以将该类用作\MyCompany\Utility\Logger.

You would then be able to use the class as \MyCompany\Utility\Logger.

请注意，在PSR-4中，与PSR-0不同，通常会从目录结构中省略MyCompany，而只需使用app/lib/.

Note that in PSR-4, unlike PSR-0, you'd normally omit MyCompany from the directory structure, and just use app/lib/.

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