https://getcomposer.org/download/

安装是否成功测试

（三）安装composer.json【参考：https://www.cnblogs.com/xiaoleiel/p/11160516.html】

{
     "require": {
         "guzzlehttp/guzzle": "4.2.*",
         "league/csv": "6.0.*",
         "spatie/string": "1.8.*"
     }
}

生成如下文档结构