How to display next and previous records in php

[Sophia_1]

Hi everyone, tried to display next and previous records from the coding below but unable to do so.It suppose to display next records for the current user with the when user click "Next" but currently it doesn't display "Next" but only display "Random". When i clicked "Random", it displays next records for all users. The following message also is displayed ie "Champ: 'picid' dans field list est ambiguRandom". The same goes to "Previous". Please advise.
Thanks.

            <?php
            error_reporting(E_ALL ^ E_NOTICE);
            $host = 'localhost';  
            $user = 'user';  
            $pass = '';  
            $dbname = 'pq';  
            $con = mysqli_connect($host, $user, $pass,$dbname);  
            if(!$con){  
              die('Could not connect: '.mysqli_connect_error());  
            }
                $_SESSION['userid']; // it will print the userid value

            $currentId = mysqli_real_escape_string($con,$_GET['picid']);
            if($q = mysqli_query($con, 'SELECT *,
            (SELECT IFNULL(max(picid),-1) FROM general,progress WHERE userid='.$_SESSION['userid'].' and  `general.picid` < '.$currentId.') as previousid,
            (SELECT IFNULL(min(picid),-1) FROM general,progress WHERE userid='.$_SESSION['userid'].' and `general.picid` > '.$currentId.') as nextid
              FROM general,progress WHERE `general.picid` = ' . $currentId)){
                if($row = mysqli_fetch_array($q, MYSQL_BOTH)){

                 echo '<div id="picid">picid' . $row['picid'] . '</div>';
                 echo '<div id="userid">userid ' . $row['userid'] . '</div>';
                echo '<div id="progress">progress ' . $row['progress'] . '</div>'; 
                echo '<div id="Rating">Rating ' . $row['Rating'] . '</div>';
                    if ($row['previousid'] > -1){
                        echo '<a href="progress.php?picid='.$row['previousid'].'"class="random">Previous</a>';
                    }
                    if ($row['nextid'] > -1){
                        echo '<a href="progress.php?picid='.$row['nextid'].'"class="random">Next</a>';
                    }
                } else {
                    echo 'Not found';
                }
            } else {
                echo mysqli_error($con);
            }
            echo "</div>"; 
            $query = "select * from general,progress order by RAND() LIMIT 1";
            $result = mysqli_query($con, $query) or die("Query failed: " . mysqli_errno($con));
            while ($row = mysqli_fetch_array($result, MYSQL_BOTH)){
                echo '<a href="ipdprogress.php?picid='.$row['picid'].'"class="random">Random</a>';
            }
            mysqli_close($con); 
            ?>

[jkon]

It seems that what you want is a simple pagination. Is this the case?

Of course you can get the previous or next record of a record received by a sql query but this is a bit more complicated and probably has nothing to do with what you mean.

[Sophia_1]

Hi everyone, managed to get the next and previous records with the coding below but the next and previous records are from progress table only. Please advise how to get the next and previous records from 2 tables ie general table and progress table. Fyi, the fields for general (userid,picid) and progress (picid,progress,rating). Thanks a lot.

            <?php
            error_reporting(E_ALL ^ E_NOTICE);
            $host = 'localhost';  
            $user = 'user';  
            $pass = '';  
            $dbname = 'pq';  
            $con = mysqli_connect($host, $user, $pass,$dbname);  
            if(!$con){  
              die('Could not connect: '.mysqli_connect_error());  
            }
                $_SESSION['userid']; // it will print the userid value

            $currentId = mysqli_real_escape_string($con,$_GET['picid']);
            if($q = mysqli_query($con, 'SELECT *,
            (SELECT IFNULL(max(picid),-1) FROM progress WHERE `picid` < '.$currentId.') as previousid,
            (SELECT IFNULL(min(picid),-1) FROM progress WHERE  `picid` > '.$currentId.') as nextid 
              FROM progress WHERE `picid` = ' . $currentId)){
                if($row = mysqli_fetch_array($q, MYSQL_BOTH)){   
                 $picid=$row['picid'];
                 $userid=$row['userid'];
                $progress=$row['progress'];     
                 $rating=$row['rating'];
                    if ($row['previousid'] > -1){
                      echo '<a href="progress.php?picid='.$row['previousid'].'"class="random">Previous</a>';
                            }
                    if ($row['nextid'] > -1){
                       echo '<a href="progress.php?picid='.$row['nextid'].'"class="random">Next</a>';
                       }
                } else {
                    echo 'Not found';
                }
            } else {
                echo mysqli_error($con);
            }
            echo "</div>"; 
            mysqli_close($con); 
            ?>