解决 Composer 报错 InvalidArgumentEx

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composer 在 2020-11-24 发布了全新的 2.0 版本。参考官方博客

鉴于博客里描述新版在很多方面都做出了优化，特别是性能方面，提速了很多，于是笔者迫不及待地更新了。

测试的是无缓存下的耗时（"初始化update" + "install"），表现出了60%的提速

但是在写上一篇文章 php 调试指南（Xdebug版）的篇头处，执行 composer require mikecao/flight 缺发生了异常

  [RuntimeException]
  No composer.json present in the current directory, this may be the cause of the following exception.



  [InvalidArgumentException]
  Could not find package mikecao/flight.

  Did you mean one of these?
      mikecao/flight
      geogkary/breeze

分析报错信息，提示找不到 mikecao/flight，又问我是不是想找 mikecao/flight。

这。。。有毒吧

会不会是 Composer 2.0 的 bug？不科学呀，不至于有这么大的bug还发布了出来。

会不会是我的配置有问题？查看一下 配置文件

$ cat ~/.composer/config.json
{
    "config": {},
    "repositories": {
        "packagist": {
            "type": "composer",
            "url": "https://packagist.phpcomposer.com"
        }
    }
}

可以看到除了 镜像源 以外并无其他的配置。

问题会不会出在 镜像源 上呢，反正排除法就那么多选项

1. 删除 镜像源
2. 删除 composer 二进制文件以及程序目录 $HOME/.composer 后重装

将 config.json 的 packagist 块删除后（亦可执行 composer config -g --unset repos.packagist），再次执行 require

$ composer require mikecao/flight
Using version ^1.3 for mikecao/flight
./composer.json has been updated
Running composer update mikecao/flight
Loading composer repositories with package information
Updating dependencies
Lock file operations: 1 install, 0 updates, 0 removals
  - Locking mikecao/flight (v1.3.8)
Writing lock file
Installing dependencies from lock file (including require-dev)
Package operations: 1 install, 0 updates, 0 removals
  - Installing mikecao/flight (v1.3.8): Extracting archive
Generating autoload files

Bingo! 异常报错消失了

可是该镜像源 Packagist / Composer 中国全量镜像 笔者已经使用了好多年了，怎么突然就挂了呢？网上也搜不到它的 停服 消息。

考虑到国内的网络环境，得重新找一个镜像源。

经过一番网罗，笔者最终敲定选用 阿里云 Composer 全量镜像，配置命令：

$ composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/

其他的推荐镜像源：

• 华为云 https://mirrors.huaweicloud.com/repository/php/

次选镜像源：

• 腾讯云 https://mirrors.cloud.tencent.com/composer/
• 上海交通大学 https://packagist.mirrors.sjtug.sjtu.edu.cn

列为次选是因为还未支持 Composer2，运行时会有 黄色警告

Composer 2 repository support for https://mirrors.xxx.com/composer has been disabled due to what seems like a misconfiguration. If this is a packagist.org mirror we recommend removing it as Composer 2 handles network operations much faster and should work fine without.