执行命令：

composer install

提示：

  2. Cloning failed using an ssh key for authentication, enter your GitHub credentials to access private repos
  3. Head to https://github.com/settings/tokens/new?scopes=repo&description=Composer+on+VM_0_6_centos+2020-03-24+0758
  4. to retrieve a token. 
  6. It will be stored in "/root/.config/composer/auth.json" for future use by Composer.
  7. Token (hidden):

不输入 token，直接回车，提示：

  1. Invalid token provided.
  3. You can also add it manually later by using "composer config --global --auth github-oauth.github.com <token>"

问题的来源：

出现这个问题，原因是 GitHub 的限制（api-rate-limit-and-oauth-tokens），具体详情看这里。

如何解决问题呢？

1、创建 GitHub tokens，点击链接直达.
1.1 选中左侧的: Personal access tokens (Tokens you have generated that can be used to access the Github API).

1.2 点击按钮： Generate new token, -> Select scopes（选择恰当的 scopes，我选了 read:package, gist 两项）


2、添加 auth.json 到项目根目录，auth.json 内容如下：

  1. {
  2.     "http-basic": {},
  3.     "github-oauth": {
  4.         "github.com": "162cd2d43c9cc308c9bc65ba041e7b2245e00975"
  5.     }
  6. }

**

最后执行：

composer install