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

從git版本庫複製下來Laravel項目之後，忘了composer install ,結果爆了如下錯誤~

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

運行：
composer install
結果又報錯：

ubuntu@ip-172-31-4-119:$ composer installLoading composer repositories with package informationInstalling dependencies (including require-dev) from lock fileYour 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，有個包的要求是php版本大於7.1我的是7.0.22，解決辦法有兩種， 一是忽略：

composer install --ignore-platform-reqs

二是直接刪除composer.lock，我是直接把它移動到另外一個地方去了。

然後再：composer install

再次訪問網站，就可以了。