composer安装laravel时环境变量引起的小错误

在按照官方使用laravel安装器安装laravel时，

composer global require laravel/installer

 laravel运行文件没有保存至环境变量$PATH中，所以出现以下错误：                                                                                                                                                                                                                                                                                                                                      

- Installing doctrine/inflector (1.3.1): Cloning ec3a552422     
Cloning failed using an ssh key for authentication, enter your GitHub credentials to access private repos 
Head to https://github.com/settings/tokens/new？scopes=repo&description=Composer+on+6dc4bfbfa34e+2020-04-22+0211       
to retrieve a token. It will be stored in "/root/.composer/auth.json" for future use by Composer.                    
Token (hidden):                                                                                                                                                                                                                                                                                                                                                     [Composer\Downloader\TransportException]
The "https://api.github.com/" file could not be downloaded: SSL: Success Failed to enable crypto failed to open stream: operation failed                                                                                                                                       

laravel执行文件放在了 /root/.composer/vendor/bin/laravel下，

而Linux的环境变量PATH是/usr/local/bin

所以可以在PATH下创建个软链接至laravel执行文件即可

ln -s /usr/local/bin/larvel /root/.composer/vendor/bin/laravel