《PHP教程:Composer设置忽略版本匹配的方法》要点:
本文介绍了PHP教程:Composer设置忽略版本匹配的方法,希望对您有用。如果有疑问,可以联系我们。
PHP应用Composer简介
PHP应用Composer 是 PHP 的一个依赖管理工具.它允许你申明项目所依赖的代码库,它会在你的项目中为你安装他们.Composer 不是一个担保理器.是的,它涉及 "packages" 和 "libraries",但它在每个项目的基础上进行管理,在你项目的某个目录中(例如 vendor)进行安装.默认情况下它不会在全局安装任何东西.因此,这仅仅是一个依赖管理.
PHP应用执行composer install遇到差错: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.
PHP应用完整差错如下:
PHP应用
vagrant@homestead:/usr/share/nginx/html/laravel-blog$ sudo 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 1.0.3 -> satisfiable by doctrine/instantiator[1.0.3].
- doctrine/instantiator 1.0.3 requires php ~5.3 -> your PHP version (7.0.3) does not satisfy that requirement.
Problem 2
- doctrine/instantiator 1.0.3 requires php ~5.3 -> your PHP version (7.0.3) does not satisfy that requirement.
- phpunit/phpunit-mock-objects 2.3.0 requires doctrine/instantiator ~1.0,>=1.0.1 -> satisfiable by doctrine/instantiator[1.0.3].
- Installation request for phpunit/phpunit-mock-objects 2.3.0 -> satisfiable by phpunit/phpunit-mock-objects[2.3.0].
PHP应用提示我的PHP 7版本太高,不符合composer.json必要的版本,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:
PHP应用
composer install --ignore-platform-reqs
PHP应用or
PHP应用
composer update --ignore-platform-reqs
PHP应用再次执行composer命令可以正常安装包了.
PHP应用如果提示警告:
PHP应用
Cannot create cache directory /home/vagrant/.composer/cache/repo/https---packagist.org/, or directory is not writable. Proceeding without cache
Cannot create cache directory /home/vagrant/.composer/cache/files/, or directory is not writable. Proceeding without cache
PHP应用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.
PHP应用
sudo chmod -R 777 /home/vagrant/.composer/cache/files/
PHP应用另外,在虚拟机中也设置composer为国内镜像,否则下载速度慢的要死,执行:
PHP应用
composer config -g repo.packagist composer https://packagist.phpcomposer.com
PHP应用OK,年夜功告成.
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