Pomoc z výpisom súborov

<?php
  $files_max = 100;   //maximálny počet zobrazovaných súborov

  $zlozka = dir("./");
  while($file = $zlozka->read()) {
    if ($file == "." || $file == ".." || ((substr($file,-4) !== ".jpg") && (substr($file,-4) !== ".JPG"))) continue;
    $files[] = $file;
  }
  $zlozka->close();



  sort($files);
  reset($files);
  
  $max = count($files);
  if ($max > $files_max) $max = $files_max;
  
  if (empty($_GET["page"])) $page = 1;
  else $page = $_GET["page"];



  /* ----- Pomocné premenné ----- */
  $a = (($page-1)*$max);
  $b = (($a+$max)-1);
  $c = 1;
  $d = 0;



  /* ----- Výpis súborov ----- */
  if (file_exists($files[$a])) {
    $i = $a;
    while (($i <= $b) && file_exists($files[$i])) {
       echo "<small><a style='text-decoration:none;' href='./".$files[$i]."' target='_blank'>".$files[$i]."</a><br></small>";
       $i++;
    }
  }
?>
<p></p>
<?php
  /* ----- Stránkovanie ----- */
  if ($page == 1) {
    echo "| 1 ";
    $c++;
    $d = $d+$max;
    while (file_exists($files[$d])) {
      echo "| <small><a style='font-weight: bold;' href='./?page=$c'>$c</a></small> ";
      $c++;
      $d = $d+$max;
    }
    echo "|";
  }

  elseif (($page > 1) && (file_exists($files[$b]))) {
    while (($c <= ($page-1)) && file_exists($files[$d])) {
      echo "| <small><a style='font-weight: bold;' href='./?page=$c'>$c</a></small> ";
      $c++;
      $d = $d+$max;
    }
    echo "| $page ";
    $c++;
    $d = $d+$max;
    while (file_exists($files[$d])) {
      echo "| <small><a style='font-weight: bold;' href='./?page=$c'>$c</a></small> ";
      $c++;
      $d = $d+$max;
    }
    echo "|";
  }

  elseif (($page > 1) && (file_exists($files[$a]))) {
    while (($c <= ($page-1)) && file_exists($files[$d])) {
      echo "| <small><a style='font-weight: bold;' href='./?page=$c'>$c</a></small> ";
      $c++;
      $d = $d+$max;
    }
    echo "| $page ";
  }

  else {
    while (file_exists($files[$d])) {
      echo "| <small><a style='font-weight: bold;' href='./?page=$c'>$c</a></small> ";
      $c++;
      $d = $d+$max;
    }
    echo "|";
  }

?>