一、Composer 安装包
composer install 之后报错
vagrant@homestead:~/Code/sample$ composer install
Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Your requirements could not be resolved to an installable set of packages.
Problem 1
- Installation request for doctrine/instantiator 1.1.0 -> satisfiable by doctrine/instantiator[1.1.0].
- doctrine/instantiator 1.1.0 requires php ^7.1 -> your PHP version (7.0.13) does not satisfy that requirement.
Problem 2
- doctrine/instantiator 1.1.0 requires php ^7.1 -> your PHP version (7.0.13) does not satisfy that requirement.
- phpunit/phpunit-mock-objects 2.3.8 requires doctrine/instantiator ^1.0.2 -> satisfiable by doctrine/instantiator[1.1.0].
- Installation request for phpunit/phpunit-mock-objects 2.3.8 -> satisfiable by phpunit/phpunit-mock-objects[2.3.8].
二、解决方法
删除 composer.lock 文件，重新执行 composer install，这样就能重新生成 composer.lock 文件了。
composer 包自动加载后，会生成一个 composer.lock 锁文件，所以，在从GitHub拉取别人的代码后，需要对这个文件进行删除。
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