What is the use of lock files in Composer?

The following tutorial column of composer will introduce to you the role of the lock file in Composer. I hope it will be helpful to friends in need!

##composer.lock records the exact version installed. Therefore, you and your colleagues are on the same version.

Composer installationCheck the composer.lock file
If not, automatically generate the composer.lock file (use composer update)
Install the records in the composer.lock file Specified version

Composer updates Browse composer.json file
Check the availability of new (latest version) based on mentioned version criteria (e.g. 1.12.*)
Install the latest version (as per above)
Update the composer.lock file for the installed version
So in a simple manifest.

If you want all your colleagues to stay on the same version as you... Submit a GIT of your composer.lock (or vcs you have)
Ask others to get that Version's composer.lock file
Always use composer install to get the correct dependencies

If you want to upgrade system dependencies to a new version Check the composer.json file to Get the version specification.
Do a composer update
This will composer.lock the changed file with the latest version
Commit it to GIT (or vcs)
Ask others to get it composer install

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