/vendor/composer/ directorycomposer dumpautoload / composer dump-autoloadvendor/package with development modecomposer require --dev illuminate/container
The package will be listed in require-dev inside composer.json "require-dev": {
"illuminate/container": "^7.25"
}composercomposer search keyword1 keyword2composer search keywordcomposer remove vendor/package vendor/package2remove command removes packages from vendor and composer.json filecomposer remove vendor/packageminor and patch versions of the package but major will be the specified versioncomposer require "vendor/package:2.*"composer require phpunit/phpunitcomposer.json we can use --with and provide a custom versioncomposer update --with vendor/package:2.0.1