How to monitor tasks launched by shell_exec?

Question

PHP

Sometimes it happens that after running a command through shell_exec, the process crashes or something goes wrong, so how can you monitor it? for example, it performs the action of liking on VKontakte, in total they need to be put down 1000, for example, it stops at 600, and here's how you need to find out and restart the process, tell me?

Answer 1

Write logs.