PHPページング機能追加【先頭・前へ・１２３・次へ・末尾】

ファイルの表示件数が多くなってきたのでページング機能を追加しました。

<?php
  $upload_dir = '/var/www/html/php/upload/';
  if (array_key_exists('upfile', $_FILES)) {
    $upload_file = $upload_dir . basename($_FILES['upfile']['name']);
    move_uploaded_file($_FILES['upfile']['tmp_name'], $upload_file);
  }
  $page = $_REQUEST['page'];
  $maxLine = 30;
  if ($page == "" ) {
    $page = 1;
  }
  
?>
<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta charset="UTF-8">
    <title>PHPサンプル - ファイルのアップロード</title>
  </head>
  <body>
<?php
  if (array_key_exists('delfile', $_POST)) {
    $delete_file = $upload_dir . $_POST['delfile'];
    if (unlink($delete_file)){
      echo $_POST['delfile'] . "削除しました。";
    } else {
      echo $_POST['delfile'] . "削除が失敗しました。";
    }
  }
?>
    <hr>
    <form method="post" enctype="multipart/form-data">
      <input type="file" name="upfile">
      <button type="submit">送信</button>
    </form>
    <hr>
<?php
  $search = $upload_dir . "*.*";
  $i = 0;
  $ii = -1;
  foreach (glob($search) as $filename) {
    $i += 1;
    if ((int)($i/$maxLine) == ($page-1)) {
      $ii = $i;
      $filepath = pathinfo($filename);
      echo "<div>";
      echo $ii.".";
      echo "<a href='./upload/".$filepath['basename']."' target='_blank'>".$filepath['filename']."</a>";
      echo "<form style='display:inline' method='post'><input type='hidden' name='delfile' value='" . $filepath['basename'] . "'><button type='submit'>削除</button></form>";
      echo "</div>";  
    }
  }
  echo "<hr><div>";
  if ($page > 1) {
    echo "<a href='./upload.php?page=".(1)."'>先頭</a>&nbsp;";
    echo "<a href='./upload.php?page=".($page-1)."'>前へ</a>&nbsp;";
  }
  $pageLimit = $page + 5;
  $pageMax = (int)($i / $maxLine) + 1;
  if ($pageLimit > $pageMax){
    $pageLimit = $pageMax;
  }
  for($idx = $page; $idx <= ($pageLimit); $idx += 1) {
    $t = $idx;
    if ($pageMax != $pageLimit and $idx == $pageLimit){
      $t = "..";
    }
    echo "<a href='./upload.php?page=".($idx)."'>". $t ."</a>&nbsp;";
  }
  if ($ii < $i) {
    echo "<a href='./upload.php?page=".($page+1)."'>次へ</a>&nbsp;";
    echo "<a href='./upload.php?page=".($pageMax)."'>末尾</a>&nbsp;";
  }
  echo "</div>";
?>
  </body>
</html>

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