PHP/JS - print labels with Zebra FX420t

There is an webbased inventory system, and i need to print labels for inventory items in the app. Aplication is based on PHP.

Is there any printer language (so i will be able to create some "batch file"), that could be used?

If so, is there a way to put this "batch file" into the printer through some desktop tools (with GUI) ?

Or there is an another way ho to print 1000+ labels from web app?

Thanks