What are the common mistakes in Composer

This article mainly introduces what are the common mistakes in Composer, which can be used for reference. I hope you can learn a lot after reading this article.

Error encountered in executing composer install: Your requirements could not be resolved to an installable set of packages. This is because the version required by composer.json does not match.

The complete error is as follows:

Vagrant@homestead:/usr/share/nginx/html/laravel-blog$ sudocomposerinstallLoadingcomposerrepositorieswithpackage informationInstallingdependencies (includingrequire-dev) fromlockfileYourrequirementscouldnot 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].

It is suggested that my version of PHP 7 is too high to meet the required version of composer.json, but it should also run under PHP 7. Composer can be set to ignore version matching. The command is:

Composerinstall-ignore-platform-reqsorcomposerupdate-ignore-platform-reqs

Execute the composer command again to install the package normally.

If prompted to warn:

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

This is to execute composer in the virtual machine, indicating that there is no writeable permission for this directory, and composer cannot cache the downloaded package, so you have to download it again every time and change the directory to writable and readable.

Sudo chmod-R 777 / home/vagrant/.composer/cache/files/

In addition, set composer as the domestic image in the virtual machine, otherwise the download speed will be extremely slow, and execute:

Composerconfig-g repo.packagistcomposer https://packagist.phpcomposer.com

OK, it's done.

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