EZ Thumbnailer

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Here is a nice and easy image thumbnailer and simple gallery script for apache webservers written in PHP. Licensed BSD style. Feel free to use it.

File: thumb.php 

<?php
/*
 * Copyright (c) 2009, Sam Washburn
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 *
 * + Redistributions of source code must retain the above copyright notice, this list of conditions and the following
 *   disclaimer.
 * + Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided with the distribution.
 * + Neither the name of the Sam Washburn nor the names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
 
/*
 * DOCUMENTATION
 *
 * + ABOUT THE SCRIPT
 *   This script generates and optionally caches image thumbnails based upon files located in the same directory as the
 *   script.  This script is designed to only work with apache webservers that have the mod_rewrite module enabled.
 *
 * + INSTALLATION AND OPERATION
 *   1. Modify the Settings below to suit your needs.
 *   2. Create a directory on your webserver and copy the thumb.php file into that directory.
 *   3. Run the script once from your browser to set up the .htaccess and optional cache directory
 *      NOTE: You may have problems if an .htaccess file already exists.  The script will not delete modify or overwrite
 *            an existing .htaccess file.
 *   4. Upload pictures to the directory
 *   5. View full picture like this: http://www.mydomain.com/path/to/thumbs/picture.jpg
 *   6. View a thumbnail like this: http://www.mydomain.com/path/to/thumbs/picture.jpg?xs
 *      (where 'xs' is the chosen size from the $sizes array in the settings)
 *   7. Optionally you can view a numerically sized thumbnail (if enabled) like this:
 *      http://www.mydomain.com/path/to/thumbs/picture.jpg?100
 *      (where '100' is the maximum width and height of the picture)
 *   8. Optionally you can view a simplistic gallery of all the pictures in the folder like this:
 *      http://www.mydomain.com/path/to/thumbs/
 *      (if $allowIndexBrowsing is enabled)
 *
 * VERSION HISTORY
 *  0.1 Initial Release
 *
 */
 
/**
 * This array defines the allowed size tags for the thumbs and their respective max pixel width/height.
 * This will be the max width for landscape oriented pictures and the max height for portrait oriented pictures
 */
$sizes = array(
	'xs' => 80,
	's'  => 160,
	'm'  => 320,
	'l'  => 640,
	'xl' => 1024
);
/**
 * If index browsing is enabled you can view a simplistic gallery of all the pictures in the folder.
 */
$allowIndexBrowsing = true;
/**
 * This is the size used to display the pictures in the index gallery
 */
$indexThumbSize = 'xs';
/**
 * This is the number of columns of pictures in the index gallery
 */
$indexThumbCols = 4;
/**
 * If this option is enabled numeric sizing urls are allowed.  See point 7. in the installation docs above.
 */
$allowNumericSizing = false;
/**
 * If this options is enabled thumbnails will be cached to a folder called "cache" in the image directory
 */
$useCache = false;
/**
 * If caching is enabled this is the time-to-live for a cached item.  It is expressed in seconds.
 */
$cacheTTL = 86400; // 1 day (in seconds)
 
/**
 * END OF SETTINGS
 * No need to modify below this point, unless you really want to monkey with things.
 */
$fileName = $_GET['fn'];
$scriptName = basename(__FILE__);
if (!function_exists('file_put_contents')) {
	function file_put_contents($filename, $data) {
		if (($h = fopen($filename, 'w')) === false) {
			return false;
		}
		if (($bytes = fwrite($h, $data)) === false) {
			return false;
		}
		fclose($h);
		return $bytes;
	}
}
if(!file_exists(dirname(__FILE__).'/.htaccess')) {
	file_put_contents('.htaccess', <<<EOF
RewriteEngine on
RewriteRule ^(.*)$ thumb.php?fn=$1 [QSA,L]
EOF
	);
}
if(empty($fileName)) {
	if($allowIndexBrowsing) {
		$dirh = opendir(dirname(__FILE__));
		if ($dirh) {
			$c = 0;
			?>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link href="style.css" rel="stylesheet" type="text/css">
<title>Images</title>
</head>
<body>
<h2>Image Listing</h2>
			<?
			while ($de = readdir($dirh)) {
				switch($de){
					case '.':
					case '..':
					case '.htaccess':
					case 'cache':
					case $scriptName:
						// Do nothing
						break;
					default:
						?>
<a href="<?=$de?>"><img src="<?=$de?>?<?=$indexThumbSize?>" /></a>
						<?
						$c++;
						if(($c % $indexThumbCols)==0) echo "<br/>";
				}
			}
			unset($de);
			closedir($dirh);
			?>
</body>
</html>
			<?
			exit();
		} else {
			die('Cannot access directory.');
		}
	} else {
		die('Script denies permission.');
	}
}
 
// find the size
$size = null;
foreach ($_GET as $param=>$val) {
	if($allowNumericSizing) if(is_numeric($param)) $size = $param;
	if(isset($sizes[$param])) $size = $sizes[$param];
}
if(is_null($size)) {
	// no size found.. output original image
	if(strstr($fileName,'.')!==false){
		$ext = strtolower(array_pop(explode('.',$fileName)));
		switch($ext){
			case 'jpg':
			case 'jpeg':
				$type = 'image/jpeg';
				break;
			case 'gif':
				$type = 'image/gif';
				break;
			case 'png':
				$type = 'image/png';
				break;
			default:
				die('MIME type not supported for this file.');
		}
		header("Content-type: {$type}");
	}
	readfile(dirname(__FILE__).'/'.$fileName);
	exit();
}
 
// Build a thumb
header("Content-type: image/jpeg");
$rebuildCache = false;
if($useCache) {
	if(!file_exists('cache')) mkdir(dirname(__FILE__).'/cache');
	$md5 = md5($size.'-'.$fileName);
	$cache = "cache/{$md5}.jpg";
	$rebuildCache = true;
	if(is_file($cache)===true){
		$lastMod = filemtime($cache);
		if((time()-$lastMod) <= $cacheTTL) {
			readfile($cache);
			exit();
		}
	}
}
$image = @file_get_contents(dirname(__FILE__).'/'.$fileName);
if(strlen($image)==0) die ("Cannot read picture file.");
$l = imagecreatefromstring($image);
if(imagesx($l)>imagesy($l)) {
	$width = $size;
	$height = (imagesy($l) * $size) / imagesx($l);
} else {
	$height = $size;
	$width = (imagesx($l) * $size) / imagesy($l);
}
$im = imagecreatetruecolor($width,$height);
imagecopyresampled($im, $l, 0, 0, 0, 0, imagesx($im), imagesy($im), imagesx($l), imagesy($l));
if($rebuildCache){
	imagejpeg($im,$cache,80);
	readfile($cache);
} else {
	imagejpeg($im,null,80);
}
imagedestroy($im);
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