Failed opening required 'bootstrap/../vendor/autoload.php'

从git版本库克隆下来Laravel项目之后，忘了composer install ,结果爆了如下错误~

PHP Fatal error:  require(): Failed opening required '/bcc/production/BCCAdminV1.0/bootstrap/../vendor/autoload.php' (include_path='.:/usr/share/php') in

运行：

composer install

结果又报错：

ubuntu@ip-172-31-4-119:$ 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 (7.0.22) does not satisfy that requirement.
Problem 2
- doctrine/instantiator 1.1.0 requires php ^7.1 -> your PHP version (7.0.22) 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].

ubuntu@ip-172-31-4-119:$ ll

意思是我的php版本太低，有个包的要求是php版本大于7.1我的是7.0.22，解决办法有两种，

一是忽略：

composer install --ignore-platform-reqs

二是直接删除composer.lock，我是直接把它移动到另外一个地方去了。

然后再：composer install

再次访问网站，就可以了。