Conversational chatbot?

Question

PHP

Imagine that users chat on the site, after each message I write it to the database. Tell me, how will it be correct to generate the text that the bot will send? (Words/sentences should be taken from the database, for example: there are such entries as "hello", "how are you", "what are you doing", "what's your name?", these phrases were written by the users themselves in the chat, they ended up in the database I would like to make the bot be a little smart and respond normally, for example "hello, what's your name?". Any options, how can I implement?

Answer 1

We create a virtual interlocutor
True, there is python, but it is also interesting on the topic.

Answer 2

Google about the Levenshtein algorithm.
As a result, the bot will be very stupid, but it will seem to the user that this is a real person.