php: How to save the client socket (not closed), so a further script may retrieve it to send an answer?

Question

I have a client-server application, in which the server may require to send information back to clients.

As the client-server pattern does not allow the server to \"

Answer 1

One way to solve it - forget about sockets.

Pseudocode:

// receive request, set some session_id if not exists
// request contains last_timestamp, so we know which data client already have
// check have we any dataset for this session_id after last_timestamp
// return this dataset, or no_new_data signature

Data can be stored in database, for example.