thumb.php

Erstellt ein Miniaturbild von lokalen oder entfernen Bilddateien (inkl. Caching).

thumb.php

<?
	/*
 
	##################################################################################################
	thumb.php
	written by Heiko Barth :: 2005; improved 2007
	www.heiko-barth.de
 
	Copyright (c) 2005 Heiko Barth
 
	This script is distributed in the hope that it will be useful, but WITHOUT
	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	FITNESS FOR A PARTICULAR PURPOSE.
 
	USING AT YOUR OWN RISK.
	##################################################################################################
 
	*/
 
	// cache mode settings
	$cache = true;						// true/false --> enable/disable cache mode
		$cache_dir = "./cache";				// server directory -> must be writeable
		$cache_web_dir = "/fotos/cache";	// web directory
 
	$allow_remote = false;					// allow remote located images; when setting true be sure to also set allow_url_fopen=on in your server php.ini
 
	$default_width = 160;					// define default width
	$default_height = 120;					// define default height
 
	// So if there's something you don't like, don't sit on the sidelines. Get involved and reform it. Evolution works better than revolution, after all!
 
	// imagecopyresampled can be used instead of imagecopyresized; its a bit slower, but ppl think there are better quality results - not my opinion ;-)
 
	// requiered argument
	$pic = $_REQUEST["pic"];
 
	if (!$allow_remote) {
		if (preg_match('/^(http|ftp):/i', $pic)) {
			die("Remote images are not allowed.");
		}
	}
 
	// optional parameters
	$maxwidth = (isset($_REQUEST['width']) ? floor($_REQUEST['width']) : $default_width);
	$maxheight = (isset($_REQUEST['height']) ? floor($_REQUEST['height']) : $default_height);
 
	$getimg = @getimagesize($pic);
	// 0. width
	// 1. height
	// 2. typ: 1=GIF, 2=JPEG, 3=PNG
	// 3. html tag (e.g. 'width="111" height="24"')
 
	// preventing from accessing non gfx files.
	if ($getimg[2] < 1 || $getimg[2] > 3 || $getimg[2] == "") {
		die("No valid gfx-source.");
	}
 
	$oldwidth = $getimg[0];
	$oldheight = $getimg[1];
 
	// if original is smaller then or equal to new image
	if ($oldwidth <= $maxwidth && $oldheight <= $maxheight) {
		header("HTTP/1.1 302 Found");
		header("Location: " . $pic);
	}
	else {
		// image should be resized
		$widthdif = $oldwidth / $maxwidth;
		$heightdif = $oldheight / $maxheight;
		$maxdif = max($widthdif, $heightdif);
		$newwidth = floor($oldwidth / $maxdif);
		$newheight = floor($oldheight / $maxdif);
 
		// caching enabled
		if ($cache) {
			$char_replace = array(".", "/");
			$cache_dir = $cache_dir . "/" . str_replace($char_replace, "", dirname($pic)) . "w" . $newwidth . "h" . $newheight . basename($pic);
			$cache_web_dir = $cache_web_dir . "/" . str_replace($char_replace, "", dirname($pic)) . "w" . $newwidth . "h" . $newheight . basename($pic);
			if (file_exists($cache_dir)) {
				// yeah, cached content
				header("HTTP/1.1 302 Found");
				header("Location: " . $cache_web_dir);
				die;
			}
		}
 
		$smallimg = imagecreatetruecolor($newwidth,$newheight);
 
		switch ($getimg[2]) {
			case 1:
				// gif image
				$bigimg = imagecreatefromgif($pic);
				imagecopyresized($smallimg, $bigimg, 0, 0, 0, 0, $newwidth, $newheight, $oldwidth, $oldheight);
 
				if ($cache) {
					imagegif($smallimg, $cache_dir);
					header("HTTP/1.1 302 Found");
					header("Location: " . $cache_web_dir);
				}
				else {	
					header("Content-Type: image/gif");
					imagegif($smallimg);
				}
				break;
 
			case 2:
				// jpg image
				$bigimg = imagecreatefromjpeg($pic);
				imagecopyresized($smallimg, $bigimg, 0, 0, 0, 0, $newwidth, $newheight, $oldwidth, $oldheight);
 
				if ($cache) {
					imagejpeg($smallimg, $cache_dir);
					header("HTTP/1.1 302 Found");
					header("Location: " . $cache_web_dir);
				}
				else {	
					header("Content-Type: image/jpeg");
					imagejpeg($smallimg);
				}
				break;
 
			case 3:
				// png image
				$bigimg = imagecreatefrompng($pic);
				imagecopyresized($smallimg, $bigimg, 0, 0, 0, 0, $newwidth, $newheight, $oldwidth, $oldheight);
 
				if ($cache) {
					imagepng($smallimg, $cache_dir);
					header("HTTP/1.1 302 Found");
					header("Location: " . $cache_web_dir);
				}
				else {	
					header("Content-Type: image/png");
					imagepng($smallimg);
				}
				break;
		}
	}