Why are there two more divs every time?

I put a div outside. Why are there two more empty divs? Why do there always appear two more empty divs every time? What is the reason for this? How can I remove it?

<code>$dir = "upload/"; 
    if (is_dir($dir)){
       if ($dh = opendir($dir)){
         while (($file = readdir($dh))!= false){
            echo '<div>';
            if (!is_dir($file)) {
              $filePath = $dir.$file;
              echo "<img src='".$filePath."'/>";
            }
            echo '</div>';
         }
        closedir($dh);
       }
    }</code>

Reply content:

I put a div outside. Why are there two more empty divs? Why do there always appear two more empty divs every time? What is the reason for this? How can I remove it?

<code>$dir = "upload/"; 
    if (is_dir($dir)){
       if ($dh = opendir($dir)){
         while (($file = readdir($dh))!= false){
            echo '<div>';
            if (!is_dir($file)) {
              $filePath = $dir.$file;
              echo "<img src='".$filePath."'/>";
            }
            echo '</div>';
         }
        closedir($dh);
       }
    }</code>

Print it

<code>print_r(readdir($dh));</code>

You know why.

readdir will print out . and .., so your echo "

" should be placed inside if !is_dir

The two extra ones should be . for the current directory and . for the upper-level directory. Just filter these two out

Just make a ifjudgment

<code class="php">
$dir = "upload/"; 
if (is_dir($dir)){
   if ($dh = opendir($dir)){
     while (($file = readdir($dh))!= false){
        if (!is_dir($file)) {
        
          //. 和.. 在文件夹下，不管在什么系统中. 和..都是存在的， .指向当前目录， ..上一级目录
          if ($file === '.' || $file === '..') {
              continue;
          }
          
          echo '</div>';
          $filePath = $dir.$file;
          echo "<img src='".$filePath."'/>";
          echo '</div>';
        }
        
     }
    closedir($dh);
   }
}
</code>

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