How does readfile work?

Question

PHP

Can you tell me how the readfile function works in PHP? I need to make a php page that uploads a file to the client side from a link passed in GET parameters. Do I understand correctly that this function creates an XHR request on the client side? Or does it first upload the file to the server, the server transfers this file to the client, and then the file is deleted?

Answer 1

Have you tried reading the documentation ?
Like all other PHP functions, readfile runs exclusively on the server. It cannot create anything on the client side.