Ph_EV_KEY : How to know, which key combination was pressed?

Hello. I need know, when user pressed Ctrl+A for example, or F1.
In documentation i didn’t find useful example for such case.
Can u help me?
which flag check, and which key_cap,key_sym,key_scan use?

there is a callback information structure which should include the action and the actioneer

some example please if u could)