一个大兄弟本地用了 PHP 7.1 进行开发，而我本地是 PHP 7.0, 于是悲剧发生了。
composer install 之后报错
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/annotations v1.5.0 -> satisfiable by doctrine/annotations[v1.5.0]. - doctrine/annotations v1.5.0 requires php ^7.1 -> your PHP version (7.0.18) does not satisfy that requirement. Problem 2 - Installation request for doctrine/cache v1.7.1 -> satisfiable by doctrine/cache[v1.7.1]. - doctrine/cache v1.7.1 requires php ~7.1 -> your PHP version (7.0.18) does not satisfy that requirement. Problem 3 - Installation request for doctrine/collections v1.5.0 -> satisfiable by doctrine/collections[v1.5.0]. - doctrine/collections v1.5.0 requires php ^7.1 -> your PHP version (7.0.18) does not satisfy that requirement. Problem 4 - Installation request for doctrine/common v2.8.1 -> satisfiable by doctrine/common[v2.8.1]. - doctrine/common v2.8.1 requires php ~7.1 -> your PHP version (7.0.18) does not satisfy that requirement. Problem 5 - Installation request for doctrine/dbal v2.6.2 -> satisfiable by doctrine/dbal[v2.6.2]. - doctrine/dbal v2.6.2 requires php ^7.1 -> your PHP version (7.0.18) does not satisfy that requirement. Problem 6 - 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 (7.0.18) does not satisfy that requirement. Problem 7 - doctrine/annotations v1.5.0 requires php ^7.1 -> your PHP version (7.0.18) does not satisfy that requirement. - doctrine/dbal v2.6.2 requires php ^7.1 -> your PHP version (7.0.18) does not satisfy that requirement. - doctrine/dbal 2.5.x-dev requires doctrine/common >=2.4,<2.8-dev -> satisfiable by doctrine/common[2.7.x-dev]. - backpack/crud 3.2.21 requires doctrine/dbal ^2.5 -> satisfiable by doctrine/dbal[2.5.x-dev, v2.6.2]. - doctrine/common 2.7.x-dev requires doctrine/annotations 1.* -> satisfiable by doctrine/annotations[v1.5.0]. - Installation request for backpack/crud 3.2.21 -> satisfiable by backpack/crud[3.2.21].
解决方法是
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。
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