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执行composer install遇到错误：Your requirements could not be resolved to an installable set of packages. 这是因为不匹配composer.json要求的版本。

完整错误如下：

1 2 3 4 5 6 7 8 9 10 11 12

vagrant@homestead:/usr/share/nginx/html/laravel-blog$ sudocomposerinstall Loadingcomposerrepositorieswithpackage information Installingdependencies (includingrequire-dev) fromlockfile Yourrequirementscouldnot beresolvedto aninstallablesetofpackages.       Problem 1      - Installationrequestfor doctrine/instantiator 1.0.3 -> satisfiablebydoctrine/instantiator[1.0.3].      - doctrine/instantiator 1.0.3 requiresphp ~5.3 -> yourPHPversion (7.0.3) doesnot satisfythatrequirement.    Problem 2      - doctrine/instantiator 1.0.3 requiresphp ~5.3 -> yourPHPversion (7.0.3) doesnot satisfythatrequirement.      - phpunit/phpunit-mock-objects 2.3.0 requiresdoctrine/instantiator ~1.0,>=1.0.1 -> satisfiablebydoctrine/instantiator[1.0.3].      - Installationrequestfor phpunit/phpunit-mock-objects 2.3.0 -> satisfiablebyphpunit/phpunit-mock-objects[2.3.0].

提示我的PHP 7版本太高，不符合composer.json需要的版本，但是在PHP 7下应该也是可以运行的，composer可以设置忽略版本匹配，命令是：

1	composerinstall --ignore-platform-reqs

或者

1	composerupdate --ignore-platform-reqs

再次执行composer命令可以正常安装包了。

如果提示警告：

1 2	Cannotcreatecachedirectory /home/vagrant/.composer/cache/repo/https---packagist.org/,  or directoryis not writable. Proceedingwithoutcache    Cannotcreatecachedirectory /home/vagrant/.composer/cache/files/,  or directoryis not writable. Proceedingwithoutcache

这是在虚拟机中执行composer，提示这个目录没有可写权限，composer无法缓存下载的包，这样就每次都得重新下载，把目录改成可写可读即可。

1	sudo  chmod -R 777 /home/vagrant/.composer/cache/files/

另外，在虚拟机中也设置composer为国内镜像，不然下载速度慢的要死，执行：

1	composerconfig -g repo.packagistcomposerhttps: //packagist.phpcomposer.com