How to receive data via socket?

Question

PHP

Good afternoon friends!
The task before me is:
Send data to the server via socket, receive a response from the server and display it on the page. I found how to solve this using AJAX - learn.javascript.ru/websockets, but as I understand it, this solution causes a cross-platform problem, since Andriod and iOS are not supported;
How can this functionality be implemented for all devices?
It is possible to access from AJAX to PHP, and from there to the server, but how to implement something in PHP, Google does not help?
Maybe faced, who? Please tell me which direction to go