How to log in to a third-party site using php?

Question

PHP

There is a task for the user to click on the link posted on site A, go to site B and automatically log in with a specific login / password.
For example, on my site (example.com) a user clicks on a link and gets to the site orion10.ru authorized with a specific login password.
How to implement this using php?

Answer 1

Using curl, we log in to that site, get a cookie, write it to our user, then redirect the user to the site.