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问题背景：

# composer require xxx/yyy

结果报错：

[InvalidArgumentException]                                                                                                                       
  Could not find a version of package xxx/yyy matching your minimum-stability (stable). Require it with an explicit version constrai  
  nt allowing its desired stability. 

解决方案：

1、新建 composer.json

2、新增如下内容：

{
  "require": {
    "xxx/yyy": "dev-master"
  }
}

# composer install