how to make this code work?

[tharindu96]

http://localhost/download.php?lt=a&sr=0&sp=9

lt = letter(eg:- a,b)
sr = start
sp = stop

   <?php
    if(isset($_GET['lt'])){
        $lt = $_GET['lt'];
        if(isset($_GET['sr'])&&isset($_GET['sp'])){
        $sr = $_GET['sr'];
        $sp = $_GET['sp'];
            if(!empty($lt)){
                if(!empty($sr)&&!empty($sp)&&$sp!=9){
                    if(strlen($lt) == 1){
                        echo '<h2>'.strtoupper($lt).' Games</h2>';
                        $nquery = "SELECT * FROM `games` WHERE `flname` = '".$lt."' OR '".strtoupper($lt)."' ORDER BY `created` ASC LIMIT ".$sr." ".$sp."";
                        if($nquery_result = mysql_query($nquery)){
                            if($nquery_num = mysql_num_rows($nquery_result)){
                                while($nquery_r = mysql_fetch_assoc($nquery_result)){
                                $nquery = "SELECT * FROM `games` WHERE `flname` = '".$lt."' OR '".strtoupper($lt)."' ORDER BY `created` ASC LIMIT ".$sr." ".$sp."";
                                $nquery_result = mysql_query($nquery);
                                $nquery_r = mysql_fetch_assoc($nquery_result);
                                echo '<article>';
                                echo '<a href="game.php?id='.$nquery_r['id'].'"><div id="g_head">'.$nquery_r['name'].'</div></a><br>';
                                echo '<a href="game.php?id='.$nquery_r['id'].'"><img src="'.$nquery_r['image'].'" alt="'.$nquery_r['alt'].'" width = "150px"></a>';
                                echo '</article>';                
                                }
                                while($sp<$nquery_num){
                                    $sr = $sr + 10; 
                                }
                            }else{
                                echo 'Ok2';
                            }
                        }else{
                            echo 'Ok3';    
                        }
                    }
                }
            }
        }
    }else{
        echo '<h2>Latest Games</h2>';
        $nquery = "SELECT * FROM `games` ORDER BY `created` DESC LIMIT 9";
        if($nquery_run = mysql_query($nquery)){
            while($nquery_result = mysql_fetch_assoc($nquery_run)){
                echo '<article>';
                echo '<a href="game.php?id='.$nquery_result['id'].'">'.$nquery_result['name'].'</a><br>';
                echo '<a href="game.php?id='.$nquery_result['id'].'"><img src="'.$nquery_result['image'].'" alt="'.$nquery_result['alt'].'" width = "150px"/></a><br>';
                echo '</article>';
            }
        }
    }
    ?>
 

[r035198x]

What is the code doing and what do you want the code to do instead?