How to send messages to people who have subscribed to a group?

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Hey hey. There is a group in VK, it has a bot on php. How to implement mailing messages to people who have subscribed to it? For example, a bot polls service n, gets the value 1, and makes a group broadcast. I'm not an expert in php, I'm just discovering it for myself.

Answer 1

1. It is necessary to compare 2 lists with a given frequency: a list of people in the group and a list from the database to whom they have already been sent.
2. Then find the difference and get those who need to send out.
3. Send via API.