Thank you so much mate.
I have done all the required stuff and its working as per my requirements.
I have created .json file and storing all my messages there.
I just wonder though, like YOUTUBE API does provide response in CURL php for chat messages https://developers.google.com/youtube/v3/live/docs/liveChatMessages
Here, in response we get the messages in array and I can play around for pagination etc.
So I just wonder does Twitch also supports any other way like this in PHP in particular ? Or IRC is the only way ?
If you can let me know it would be great deal you know.
Thanks