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Marking the latest news as ... "new"

On some websites or forums that I usually browse, posts I haven’t read yet are marked as “new.” I would like to implement this function on the website that I developed (from time to time from time to time) - php / mySQL. How is this usually done? Do you need a cookie that remembers the last date / time of the visit? Or the last viewed posts / URL? How can I identify users?

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Cookies are just one of the possible ways to identify a user for a session or between visits without authentication. Although this is a very common and useful way. (PHP may also use sid or another parameter, although it is no longer common.)

You need to save those threads / messages that the user has read, or which he / she does not have. You can summarize everything by reading everything up to the "date" or postId for specific subforums.

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  • If the user’s date / time is within the last ten minutes, I do not update the user’s date / time.

Here is my code ...

function drawPage
    if (isLoggedIn) 
        get dbUser from database
        lastUserDateTime = dbUser.LastCommentTime
    else 
        lastUserDateTime = yesterdaye
    end if

    for each post
        get date of post 
        if post->date < lastUserDateTime mark it as new
        draw the post
    loop

    if (isLoggedIn) 
        if (lastUserDateTime + 10 mins) < now 
            dbUser.LastCommentTime = now
            update dbUser in database
        end if
    end if
end function
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