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How to create a dynamic php page

So it's actually hard to explain what I mean.

So I have this list here. Its pulls data from the db and then displays it in a DIV on my webpage.

I want it to only show the first 4 listing. Then after 4 seconds. I want it to show the next 4 listening and keep revolving like that infinitely. If someone could point me in the direction to be able to do that. Also, It needs to be updating dynamically every 4 seconds. Not when the user hits refresh.

<?php session_start(); ?>
            <head>
            <link rel="stylesheet" type="text/css" href="tablecss.css">
            <style type="text/css">

                .extra {

                    position: relative;
                    top: 50px;
                }
                body {

                    overflow: hidden;
                }


            </style>
            </head>

            <body>



            <?php

            $con = mysqli_connect('##', '##', '##', '##');
            if(mysqli_connect_errno()) {

              echo 'Failed to Connect to MySQL' . mysqli_connect_errno();
            } 
            $user = $_SESSION['username'];
            $result = mysqli_query($con, "SELECT * FROM corporations");

            echo "<table id='tb'border='1'>
            <tr>
            <th>Name</th>
            <th>Owner</th>
            <th>Last Price</th>
            <th>Volume</th>
            </tr>";



            while($row = mysqli_fetch_array($result)) {
            echo "<tr>";






                echo "<td>" . $row['name'].    "</td>";
                echo "<br>";
                echo "<td>" . $row['owner'] . "</td>";
                echo "<br>";
                echo "<td>" .'$'. $row['shareValue'] . "</td>";
                echo "<br>";
                echo "<td>" . $row['publicShares'] . "</td>";
                echo "<br>";    

            } 
            mysqli_close($con);
            ?>
            </div>

            </body>

What you can do is javascript, and use ajax. to load it every four seconds you can use setInterval( http://www.w3schools.com/jsref/met_win_setinterval.asp ), but for me its better if you use jQuery load more data on scroll .

to limit output use the limit of mysql.

see this article: http://www.mysqltutorial.org/mysql-limit.aspx

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