php shell_exec with realtime updating

Question

I have this shell program that I want to execute by php. The problem is that it can potentially take a long time, and as of that I need it to have real-time updating to the

Answer 1

there are two possible behaviors:

1. Non Block, where you need to do something else between flushs (@GameBit show how to do it).

2. With Block, where you wait until the called command finish, in this case look passthru function