PHP based self updating photo gallery.

photo_gallery.php

<?php 

#This script requires a "thumbnail" and "description" folder to be present in the directory where images are stored.
#Photos must be uploaded manually and caption files must be edited manually.
#Demo can be found here: http://michvaldes001.ddns.net/index.php?section_id=Gallery


#Main photo displaying/image processing function.
function photo_display($photo_directory) {
	
	#Open directory of photo gallery.
	if ($diropen = opendir($photo_directory)){
		
		#Sort though photos and text caption files.
		while (($files = readdir($diropen)) !== false)
			{
		
			$photo_path = ($photo_directory . "/" . $files);
			$text_file = substr($files, 0, -3) . "txt";

			#Create thumbnails if thumbnails not present. Directory is "thumbnails".
			if (!file_exists($photo_directory . "/thumbnail/" . $files)){
				echo "<h1>Thumbnails updating...</h2>";
				$photo_source_image = imagecreatefromjpeg($photo_path);
				$width = imagesx($photo_source_image);
				$height = imagesy($photo_source_image);
				$photo_virtual_image = imagecreatetruecolor(300, 200);
				imagecopyresampled($photo_virtual_image, $photo_source_image, 0, 0, 0, 0, 300, 200, $width, $height);			
				imagejpeg($photo_virtual_image, ($photo_directory. "/thumbnail/" . $files));
				unset($photo_source_image, $photo_virtual_image);
				flush();
				echo "<meta http-equiv='refresh' content='1'>";
				}

			#If create an empty text file for caption infomation if one doesn't exist.  Directory is "descriptions".
			if (!file_exists($photo_directory . "/descriptions/" . $text_file)){
				$text_file = ($photo_directory . "/descriptions/" . $text_file); 
				fopen($text_file, 'w');
				flush();
			}

			#Display thumbnails (only if associated image exists).  Caption will be present in alt tag but variable can be used
			#if you intend to integrate this gallery with Lightbox or something similar. 
			if ($files !== "thumbnail" && $files !== ".." && $files !== "." && $files !== "descriptions"){
				$description_text = file_get_contents($photo_directory . "/descriptions/" . $text_file);
				echo "<a href = '" . $photo_path . "'><img src = '" . $photo_directory . "/thumbnail/" . $files . "' alt = '" . $description_text ."'></a>";
			}
	 
		}		

	}	
closedir($photo_directory);
}


#Clean up thumbnails with no associated image (optional).
function thumbnail_cleanup($photo_directory) {

	if ($diropen = opendir($photo_directory . "/thumbnails")){
		while (($files = readdir($diropen)) !== false)	
		{
		$photo_path = ($photo_directory . "/thumbnails/" . $files);
		if (!file_exists($photo_directory . "/" . $files) && ($files !== "thumbnail" || $files !== "." || $files !== ".." || $files !== "descriptions")){
			unlink($photo_path);
			}
		}

	}

$closedir($photo_directory);
}


#Call the main image processing function
photo_display('<DIRECTORY OF YOUR GALLERY>');

#Call the thumbnail cleanup fuction (optional)
thumbnail_cleanup('<DIRECTORY OF YOUR GALLERY');


?>