omposer    install  执行

  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 (5.5.38) does not satisfy that requirement.

报错了，接着

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。

然而

  Problem 1
    - laravelista/ekko 1.4.0 requires php >=5.6.0 -> your PHP version (5.5.38) does not satisfy that requirement.
    - laravelista/ekko 1.3.3 requires php >=5.6.0 -> your PHP version (5.5.38) does not satisfy that requirement.

php版本不匹配，接着

composer install --ignore-platform-reqs     忽略版本匹配

oading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 113 installs, 0 updates, 0 removals
  - Installing psr/http-message (1.0.1): Downloading (100%)
  - Installing guzzlehttp/psr7 (1.4.2): Downloading (100%)
  - Installing guzzlehttp/promises (v1.3.1): Downloading (100%)
  - Installing guzzlehttp/guzzle (6.3.0): Downloading (100%)
  - Installing league/oauth1-client (1.7.0): Downloading (100%)
  - Installing symfony/event-dispatcher (v3.3.13): Downloading (100%)
  - Installing guzzle/guzzle (v3.8.1): Downloading (100%)
  - Installing symfony/polyfill-mbstring (v1.6.0): Downloading (100%)
  - Installing vlucas/phpdotenv (v2.4.0): Downloading (100%)

重装完成