How can PHP be used to efficiently display unread posts for a specific user in a forum?

To efficiently display unread posts for a specific user in a forum, you can store the last read post ID for each user and compare it with the latest post ID in the forum. By retrieving and displaying only the posts with IDs greater than the last read post ID, you can show the user only the unread posts. 

// Assuming $lastReadPostId is the last read post ID for the user
// Assuming $latestPostId is the latest post ID in the forum

// Retrieve unread posts for the specific user
$query = "SELECT * FROM posts WHERE post_id > $lastReadPostId AND post_id <= $latestPostId";
$result = mysqli_query($connection, $query);

// Display unread posts
while ($row = mysqli_fetch_assoc($result)) {
    echo "<div>{$row['post_content']}</div>";
}

Keywords

PHP forum user unread posts efficiency

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