einfachste Thumbnail Gallerie

<?php
$imgdir = "images/";
$dh = opendir($imgdir);
while($file = readdir($dh)) {
    switch ($file) {
        case ".":
        case "..":
            break;
        default:
        echo "<img src=\"" . $imgdir . $file ."\" height=\"100\">";
            break;
    }
}
closedir($dh);
?>

echo "<img src=\"" . $imgdir . $file ."\" height=\"100\">";

<?php

 function createimage($width, $height){
  $imgh = imagecreate($width, $height);
  $bgc = imagecolorallocate($imgh, 230, 230, 230);
  return $imgh;
 }

 if($path){ // Thumbnail

  $height = 50;  // Maximalhöhe
  $width  = 120; // Maximalbreite


 
  $img_size = getimagesize($path);
  $img_size[4] = $img_size[1]/$height;
  $faktor = 100/$img_size[4];
  $img_size[1] = $img_size[1]/100;
  $img_size[0] = $img_size[0]/100;
  $img_size[1] = $img_size[1]*$faktor;
  $img_size[0] = $img_size[0]*$faktor;

  if($img_size[0] >= 120){
    $img_size[4] = $img_size[0]/$width;
    $faktor2 = 100/$img_size[4];
    if($faktor2 << $faktor){
      $img_size[1] = $img_size[1]/100;
      $img_size[0] = $img_size[0]/100;
      $img_size[1] = $img_size[1]*$faktor2;
      $img_size[0] = $img_size[0]*$faktor2;
    }
  }

  $imgh = createimage($img_size[0], $img_size[1]);
  $imgh2 = imagecreatefromjpeg($path);
  $imgsz = getimagesize($path);
  $black = imagecolorallocate($imgh2, 0, 0, 0);

  imagecopyresized($imgh, $imgh2, 0, 0, 0, 0, $img_size[0], $img_size[1], $imgsz[0], $imgsz[1]);

  header("Content-Type: image/jpeg");
  imagejpeg($imgh, '', 100);
  imagedestroy($imgh);
 } else { // Dateianzeige
  $mydir = dir("./");
  while($file=$mydir->read()) {
    if(getimagesize($file)){
      echo '<img src="' . $PHP_SELF . '?path=' . $file . '"><br>';
	}
  }
}

?>

echo '<img src="' . $PHP_SELF . '?path=' . $file . '"><br>';

echo '<a href="'.$file.'"><img src="' . $PHP_SELF . '?path=' . $file . '"></a><br>';