<?php

$imgbrdr     = 1;
$columns     = 5;
$thmb_width  = 80;
$thmb_height = 80;

function resizeImage($originalImage,$toWidth,$toHeight){

    // Get the original geometry and calculate scales
    list($width, $height) = getimagesize($originalImage);
    $xscale=$width/$toWidth;
    $yscale=$height/$toHeight;

    // Recalculate new size with default ratio
    if ($yscale>$xscale){
        $new_width = round($width * (1/$yscale));
        $new_height = round($height * (1/$yscale));
    }
    else {
        $new_width = round($width * (1/$xscale));
        $new_height = round($height * (1/$xscale));
    }
    // Resize the original image
    $imageResized = imagecreatetruecolor($new_width, $new_height);
    $imageTmp     = imagecreatefromjpeg ($originalImage);
    imagecopyresampled($imageResized, $imageTmp, 0, 0, 0, 0,
                       $new_width, $new_height, $width, $height);

    return $imageResized;
}

function generateThumbnails(){
    global $thmb_width,$thmb_height;

    // Open the actual directory
    if ($handle = opendir(".")) {
        // Read all file from the actual directory
        while ($file = readdir($handle))  {
            // Check whether tha actual item is a valid file
            if (is_file($file)){
                // Check whether the actual image is a thumbnail
                  if (strpos($file,"_th.jpg")){
                      $isThumb = true;
                  } else {
                      $isThumb = false;
                  }

                  if (!$isThumb) {
                      // Process the file string
                      $dirName  = substr($file,0,strpos($file,basename($file)));
                      if (strlen($dirName) < 1) $dirName = ".";
                      $fileName = basename($file);
                      $fileMain = substr($fileName,0,strrpos($fileName,"."));
                      $extName  = substr($fileName,strrpos($fileName,"."),
                                          strlen($fileName)-strrpos($fileName,"."));

                      // Check if the actual file is a jpeg image
                      if (($extName == ".jpg") || ($extName == ".jpeg")){
                        $thmbFile = $dirName."/".$fileMain."_th.jpg";
                        // If a thumbnail dosn't exists tahn create a new one
                        if (!file_exists($thmbFile)){
                            imagejpeg(resizeImage($file,$thmb_width,$thmb_height)
                                     ,$thmbFile,80);
                        }
                    }
                  }
               }
           }
    }

}

function getNormalImage($file){
    $base = substr($file,0,strrpos($file,"_th.jpg"));
    if (file_exists($base.".jpg")) return $base.".jpg";
    elseif (file_exists($base.".jpeg")) return $base.".jpeg";
    else return "";
}

function displayPhotos(){
    global $columns;

    generateThumbnails();
    $count = 0;
    // Open the actual directory
    if ($handle = opendir(".")) {
        // Read all file from the actual directory
        while ($file = readdir($handle))  {
            // Check whether tha actual item is a valid file
            if (is_file($file)){
                // Check whether the actual image is a thumbnail
                  if (strpos($file,"_th.jpg")){
                    $count++;
                    if ($count > $columns) {
                        echo "\n</tr><tr>\n<td class=\"photo\">\n<a href=\"".getNormalImage($file)."\"><img src=\"".$file."\" alt=\"".$file."\" border=\"".$imgbrdr."\"/></a>\n</td>";
                        $count = 1;
                    } else {
                        echo "\n<td class=\"photo\">\n<a href=\"".getNormalImage($file)."\"><img src=\"".$file."\" alt=\"".$file."\" border=\"".$imgbrdr."\"/></a>\n</td>";
                    }

                  }
              }
        }
    }
}

?>
<center><h1>Photo Gallery</h1></center>
<table align="center">
<tr>
<?php displayPhotos(); ?>
</table>