在安裝一個開源專案時，作者本地用了PHP 7.1 進行開發，而我本地是PHP 7.0, 於是悲劇發生了,出現了這樣的錯誤：requires php ^7.1 -> your PHP version (7.0.13) does not satisfy that requirement..
composer install 之後報錯
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].
#刪除composer.lock 文件，重新執行composer install，這樣就能重新產生composer.lock 文件了。
composer 套件自動載入後，會產生一個 composer.lock 鎖定文件，所以，在從GitHub拉取別人的程式碼後，需要對這個文件進行刪除。
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