php - 如何从 Composer 包中查找安装供应商的基本目录

Question

我正在尝试从 Composer 包中查找应用程序的基目录。是否有 Composer API 或正确的方法来完成此任务。

澄清一下，如果我的软件包安装看起来像这样，并且我在这里有文件(使用 psr-4):

/home/project/vendor/Acme/my-package/src/

如何动态查找/home/project？

更新信息:

我正在尝试从根目录加载 .env 文件，该文件包含通过包内的 Dotenv 包的 API URL 端点。

Answer 1

这应该做:

<?php

$root = null;

// Set the current directory.
// Make sure you set this up so
// that you get out of your own root.
// Assuming this php file is at the root
// of this composer package, this should suffice.
$directory = dirname(__FILE__);

// Go up until you find a composer.json file
// which should exist in the ancestors
// because its a composer package.
do {
    $directory = dirname($directory);
    $composer = $directory . '/composer.json';
    if(file_exists($composer)) $root = $directory;
} while(is_null($root) && $directory != '/');

// We either are at the root or we got lost.
// i.e. a composer.json was nowhere to be found.
if(!is_null($root))
{
    // Yay! we are at the root.
    // and $root contains the path.
    // Do whatever you seem fit!
    bootstrapOrSomething();
}
else
{
    // Oh no! Can we default to something?
    // Or just bail out?
    throw new Exception('Oops, did you require this package via composer?');
}

@sven 在某些情况下，此策略可能会有所帮助。就像任何项目的通用控制台应用程序 (phar) 一样，避免全局安装，但仍加载引导文件。 Composer允许bin文件安装在根目录https://getcomposer.org/doc/articles/vendor-binaries.md ，但允许用户将 phar 文件放置在他们认为合适的任何地方是一个优点。

人们可能会争论控制反转，但在我看来，简单性有时应该发挥作用。