How to get Id by username telegram bot?

Question

PHP

I saw bots that you throw off @username and they throw off their id. How to do this with php?

Answer 1

Through some kind of bot, or through oauth2 https://core.telegram.org/widgets/login There is an example in PHP at the end of the docs.

Answer 2

This is not possible with the bot API.
Look towards MadelineProto