Introduction to solutions to common Composer errors

Below, composer uses the tutorial column to introduce solutions to common Composer errors. I hope it will be helpful to friends in need!

I encountered an error when 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$ 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].

It prompts that my PHP 7 version is too high and does not meet the version required by composer.json. However, it should also be able to run under PHP 7. Composer can be set to ignore it. The versions match. The command is:

composerinstall --ignore-platform-reqs
or
composerupdate --ignore-platform-reqs

Execute the composer command again to install the package normally.

If a warning is prompted:

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 when composer is executed in a virtual machine, prompting that this directory does not have writable permissions. Composer cannot cache the downloaded package, so it must be downloaded again every time. Just change the directory to be 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. Execute:

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

OK, and you're done.

For more composer-related technical articles, please visit the composer column: https://www.php.cn/tool/composer/

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