# composer install vs composer update

# composer install

composer install will install all the dependencies as specified in the composer.lock file.

Note: it will check if composer.lock file exists, it it doesn't, it will run composer update and create it.

# composer update

composer update will update our depencencies as they are specified in composer.json

It will do the following:

• Read composer.json
• Remove installed packages that are no more required in composer.json
• Check the availability of the latest versions of your required packages
• Install the latest versions of your packages
• Update composer.lock to store the installed packages version