How to implement asynchronous reading of a file socket?

Question

PHP

I am writing an HTTP client. The server may not respond immediately, but after N seconds (impossible to calculate). You need to perform 2 operations (one creates sockets and the other reads). If I managed to create an opening, sending does not take much time, then reading a socket from a server that did not answer causes the process to hang until the answer. How to find out if the server responded, or how to make sure that the process does not hang?