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php下composer初体验
背景
跑一个代码库没跑起来，原因是其使用了composer。其中的代码片断为：
require_once PROJECT_ROOT . 'vendor/autoload.php';
如果没有安装的话，会跑不起来。
初体验
环境准备
首先肯定有一个 composer.json 文件了。
安装
sudo apt-get install composer
安装包
composer install
更新包
composer update
结果
Installing dependencies from lock file (including require-dev)
Verifying lock file contents can be installed on current platform.
Nothing to install, update or remove
Generating autoload files
24 packages you are using are looking for funding.
Use the `composer fund` command to find out more!
FAQ
降级版本
如 Ocramius/ProxyManager在某些情况下，会报错 # getAllRawData not found in InstalledVersions，需要降级到 2.11.1。
查看当前版本：
composer show ocramius/proxy-manager
结果
versions : * 2.12.1
降级，修改 composer.json文件
"ocramius/proxy-manager": "2.11.1"
再执行
composer update