执行composer install遇到错误：Your requirements could not be resolved to an installable set of packages-博客-网页小功能

执行composer install遇到错误：Your requirements could not be resolved to an installable set of packages: 原创后端  2019-05-30 13:55:05  浏览：1357

>执行composer install遇到错误：Your requirements could not be resolved to an installable set of packages. 这是因为不匹配composer.json要求的版本。

##### 完整错误如下：
```javascript
vagrant@homestead:/usr/share/nginx/html/laravel-blog$ sudocomposerinstall
Loadingcomposerrepositorieswithpackage information
Installingdependencies (includingrequire-dev) fromlockfile
Yourrequirementscouldnot beresolvedto aninstallablesetofpackages.
 
  Problem 1
    - Installationrequestfor doctrine/instantiator 1.0.3 -> satisfiablebydoctrine/instantiator[1.0.3].
    - doctrine/instantiator 1.0.3 requiresphp ~5.3 -> yourPHPversion (7.0.3) doesnot satisfythatrequirement.
  Problem 2
    - doctrine/instantiator 1.0.3 requiresphp ~5.3 -> yourPHPversion (7.0.3) doesnot satisfythatrequirement.
    - phpunit/phpunit-mock-objects 2.3.0 requiresdoctrine/instantiator ~1.0,>=1.0.1 -> satisfiablebydoctrine/instantiator[1.0.3].
    - Installationrequestfor phpunit/phpunit-mock-objects 2.3.0 -> satisfiablebyphpunit/phpunit-mock-objects[2.3.0].
```
>提示PHP版本，不符合composer.json需要的版本

##### 解决方法
composer可以设置忽略版本匹配，命令是：
```javascript
composer install --ignore-platform-reqs
```
或
```javascript
composer update --ignore-platform-reqs
```

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