<?

	function multisort($array, $criterias)
	{
	  $sort_rule = '';
	  foreach($criterias as $criteria)
	  {
		foreach($array as $row)
		  $sort_array[$criteria['col']][] = $row[$criteria['col']];
		$sort_rule .= '$sort_array['.
		  (is_numeric($criteria['col']) ? $criteria['col'] : "'".$criteria['col']."'").
		  '], '.$criteria['dir'].',';
	  }
	  eval("array_multisort($sort_rule".' $array);');
	  return $array;
	}
	
	function imageresize($filename,$newfile,$maxwidth,$maxheight) {

		if (is_file($filename)) {
  
			$fd = @fopen($filename,"r");
			$image_string = fread($fd,filesize($filename));
			fclose($fd);
  
			$im = ImageCreateFromString($image_string);
			$currwidth = ImageSX($im);
			$currheight = ImageSY($im);

			$nwidth = $currwidth;
			$nheight = $currheight;
  
			if ($currwidth > $maxwidth) {
  
				$teiler = $currwidth / $maxwidth;
				$nwidth = $currwidth / $teiler;
				$nheight = $currheight / $teiler;
    
				if ($nheight > $maxheight) {
    
					$teiler = $nheight / $maxheight;
					$nheight = $nheight / $teiler;
					$nwidth = $nwidth / $teiler;
    
				}
  
			} elseif ($currheight > $maxheight) {
  
				$teiler = $currheight / $maxheight;
				$nwidth = $currwidth / $teiler;
				$nheight = $currheight / $teiler;
    
				if ($nwidth > $maxwidth) {
    
					$teiler = $nwidth / $maxwidth;
					$nheight = $nheight / $teiler;
					$nwidth = $nwidth / $teiler;
    
				}
  
			}
  
			$nwidth = intval($nwidth);
			$nheight = intval($nheight);

			$newim = imagecreatetruecolor ($nwidth, $nheight);
    
			imagecopyresampled($newim,$im,0,0,0,0,$nwidth,$nheight,$currwidth,$currheight);
			
			imagejpeg($newim,$newfile);
			ImageDestroy($im);
			ImageDestroy($newim);
			
			return ("ok");

		} else {
  
			return ("fehler");

		}
  
	}

?>