<?php

    /*
        Thumbnails erstellen

        Aktion: PHP Scripte für die armen dieser Welt
        Der Erlös geht für mein Pausenbrot drauf

        Copyright (c) 2004 by Phillip 'Firebird' Berndt
    */
   
    if(!function_exists('file_get_contents'))
    {
        function file_get_contents($filename)
        {
            return implode('', file($filename));
        }
    }
   
    function thumbnail($imgFile, $maxWidth = 200, $maxHeight = 150, $output = '')
    {
        if(!function_exists('imagecreatefromstring'))
            trigger_error('GD Library not found', E_USER_ERROR);
           
        if(!file_exists($imgFile))
            trigger_error('File not found: '.$imgFile, E_USER_ERROR);
       
        $image = imagecreatefromstring(file_get_contents($imgFile))
            or trigger_error($imgFile.' is no valid image', E_USER_ERROR);
           
        $oldSize = $imgSize = array(imagesx($image), imagesy($image));
       
        if($imgSize[0] > $maxWidth)
        {
            $imgSize[1] *= $maxWidth / $imgSize[0];
            $imgSize[0] =  $maxWidth;
        }
       
        if($imgSize[1] > $maxHeight)
        {
            $imgSize[0] *= $maxHeight / $imgSize[1];
            $imgSize[1] =  $maxHeight;
        }
       
        if(function_exists('imagecreatetruecolor'))
        {
            $thumbnail = imagecreatetruecolor($imgSize[0], $imgSize[1]);
            imagecopyresampled($thumbnail, $image, 0, 0, 0, 0, $imgSize[0], $imgSize[1], $oldSize[0], $oldSize[1]);
        }
        else
        {
            $thumbnail = imagecreate($imgSize[0], $imgSize[1]);
            imagecopyresized($thumbnail, $image, 0, 0, 0, 0, $imgSize[0], $imgSize[1], $oldSize[0], $oldSize[1]);
        }
       
        imagedestroy($image);
        if($output == '')
            header('Content-type: image/jpeg');
        imagejpeg($thumbnail, $output, 80);
        imagedestroy($thumbnail);
    }
   
    thumbnail('Beispiel.jpg', 100, 100);
?>