使用 glob 检索图像的 PHP 分页

2022-01-04 00:00:00 glob php pagination

我正在尝试使用 glob() 从文件夹中检索图像，我希望对它进行分页，以便每页仅显示 3 个图像.

I'm trying to retrieve images from a folder using glob() and i want it to be paginated so it only displays 3 images per page.

从网上和 S.O.我有下面的代码.问题是它只从目录中提取三张图片，当我点击下一页时，它显示了相同的三张图片.

From digging around on the internet and here on S.O. i've got the code below. The problem is that it only pulls three images from the directory and when i click on the next page it shows the same 3 images.

使用 glob 为每个页面获取不同图像的最佳方法是什么?

What would be the best way to fetch different images for each page using glob?

        $imagesDir = 'uploadedImages/thumbs/*';
     $itemsPerPage = 3;
     $currentPage = isset($_GET['page']) ? $_GET['page'] : 1;
     $totalItems = getTotalItems($imagesDir);
     $totalPages = ceil($totalItems / $itemsPerPage);

     getItemsFromPage($currentPage, $itemsPerPage, $imagesDir);
     getPager($totalPages, $currentPage);

     //counts the number of files in the dir
     function getTotalItems($imagesDir) {
      $numImages = count(glob($imagesDir));
      return $numImages;
     }

     //gets the files from the dir
     function getItemsFromPage($page, $numItems, $dir) {

      $x = 0;

      //get the first 3 items from the 
      foreach(glob($dir) as $image)
      {
       if($x < $numItems)
       {
        echo "<li><img src="$image" alt="$image" /></li>";
        $x++;
       }
       else
       {
        break;
       }
      }
     }

     //creates the pages and the links
     function getPager($totalPages, $currentPage) {

      // if we're not on the first page, show the previous page and first page links
      if($currentPage > 1)
      {
       $prevPage = $currentPage - 1;

       echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=1'><<</a> ";    
       echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$prevPage'><</a> ";
      }

      $range = 1;

      // show what page we're on and the page numbers surround this page
      for($x = ($currentPage - $range); $x < ($currentPage + $range) +1; $x++)
      {
       if(($x > 0) && ($x <= $totalPages)) 
       {
        if($x == $currentPage)
        {
         echo " [<b>$x</b>] ";
        }
        else
        {
         echo " <a href='{$_SERVER['PHP_SELF']}?currentPage=$x'>$x</a> ";
        }
       }
      }

      // if we're not on the last page show the next page and last page links
      if($currentPage != $totalPages)
      {
       $nextPage = $currentPage + 1;

       echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$nextPage'>></a> ";
       echo " <a href='{$_SERVER['PHP_SELF']}?currentpage=$totalPages'>>></a> ";
      }
     }

推荐答案

 function getItemsFromPage($page, $numItems, $dir) {

  $offset = ($page - 1) * $numItems;
  $x = 0;

  //get the first 3 items from the 
  foreach(glob($dir) as $image)
  {
   if($x < $offset)
   {
    $x++;
   }
   elseif($x < $numItems + $offset)
   {
    echo "<li><img src="$image" alt="$image" /></li>";
    $x++;
   }
   else
   {
    break;
   }
  }
 }

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