I want to try to make a chat system using php, ajax, databases and I`ve been curious how they make (for example) the online/offline status (notifications, messages) actualize, do they just refresh the code every second? or is there a sneaky way of not running a script every second
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[this](https://stackoverflow.com/a/1219537/2996989) might be helpful – Ahmed Sunny Nov 04 '19 at 11:55
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You should read about websockets and socket.io . Ajax is powerful but is not meant for the purpose you are looking for.
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