<?php

function resize($original_image, $thumb_width, $resized_image, $thumbdir, $orig_image_dir)
{
$max_width=$thumb_width;

//Check if GD extension is loaded
if (!extension_loaded('gd') && !extension_loaded('gd2'))
{
trigger_error("GD is not loaded", E_USER_WARNING);
return false;
}

//Get Image size info
list($width_orig, $height_orig, $image_type) = getimagesize($orig_image_dir."/".$original_image);

switch ($image_type)
{
case 1: $im = imagecreatefromgif($orig_image_dir."/".$original_image); break;
case 2: $im = imagecreatefromjpeg($orig_image_dir."/".$original_image); break;
case 3: $im = imagecreatefrompng($orig_image_dir."/".$original_image); break;
default: trigger_error('Unsupported filetype!', E_USER_WARNING); break;
}

//calculate the height/width ratio
$h_to_w_ratio = (float) $height_orig / $width_orig;

//calulate the thumbnail width based on the height
$thumb_height = round($thumb_width * $h_to_w_ratio);

while($thumb_height>$max_width)
{
$thumb_width-=10;
$thumb_height = round($thumb_width * $h_to_w_ratio);
}

$newImg = imagecreatetruecolor($thumb_width, $thumb_height);

//Check if this image is PNG or GIF, then set if Transparent*/
if(($image_type == 1) OR ($image_type==3))
{
imagealphablending($newImg, false);
imagesavealpha($newImg,true);
$transparent = imagecolorallocatealpha($newImg, 255, 255, 255, 127);
imagefilledrectangle($newImg, 0, 0, $thumb_width, $thumb_height, $transparent);
}
imagecopyresampled($newImg, $im, 0, 0, 0, 0, $thumb_width, $thumb_height, $width_orig, $height_orig);

//Generate the file, and rename it to $resized_image
switch ($image_type)
{
case 1: imagegif($newImg,$thumbdir."/".$resized_image); break;
case 2: imagejpeg($newImg,$thumbdir."/".$resized_image); break;
case 3: imagepng($newImg,$thumbdir."/".$resized_image); break;
default: trigger_error('Failed resize image!', E_USER_WARNING); break;
}

return $resized_image;

}

?>

$files=array();
$count=0;

$files=scandir(dirname(__FILE__)."/images/");

$count=count($files);

for($i=2; $i < $count; $i++)
{
echo resize($files[$i], 170, $files[$i],'thumb','images');
}

?>

$files=array();
$images=array();
$count=0;

$files=scandir(dirname(__FILE__)."/".$thumb."/");

$count=sizeof($files);
//two first file name are not valid images for some reason and you have to skip them.

for($i=0; $i<$count; $i++)
{
if($i >1)
$images[]=$files[$i];
}

$count=sizeof($images);

print('<table><tr>');

for($i=0; $i<$count; $i++)
{
//pass image name to the main image directory to display large image on the next page.

print('<td><a href="largeimage.php?path='.$orig_image_dir.'/'.$images[$i].'">
<img src="'.$thumb.'/'.$images[$i].'"></a></td>');
if(($i+1) % 6==0)
{
print('</tr><tr>');
}

}
print('</tr></table>');

?>

$imagefile="";

if(isset($_GET['path']))
$imagefile=$_GET['path'];

print('<table align="center" border="7"><tr><td>');
print('<img src="'.$imagefile.'" width="593" alt="an image caption"/>');
print('</td></tr></table>');