<?php	
	function resize_image($imagedata, $maxw, $maxh, $imgstyle = 'proportional') {
		$im = @imagecreatefromstring($imagedata);
		/* i don't want bmps
		if (!$im) {
			$im = imagecreatefrombmpstring($imagedata);
		}
		*/

		if ($im) { //if image is really an image
			$dw = $sw = imagesx($im);
			$dh = $sh = imagesy($im);
			switch ($imgstyle) {
				case 'proportional':
					if ($sw * $maxh > $sh * $maxw) { //width must fit
						$dw = $maxw;
						$dh = $dw * $sh / $sw;
					} else { //height must fit
						$dh = $maxh;
						$dw = $dh * $sw / $sh;
					}
				break;
				case 'distort':
					$dw = $maxw;
					$dh = $maxh;
				break;
				default:
					trigger_error("UNKNOWN IMAGE RESIZE STYLE [$imgstyle]");
				break;
			}
			if (($dw > $sw) && ($dh > $sh)) {
				//don't grow, just shrink, so return what i have
				return $imagedata;
			}
			$im2 = imagecreatetruecolor($dw, $dh);
			imagecopyresampled($im2, $im, 0, 0, 0, 0, $dw, $dh, $sw, $sh);
			ob_start();
			imagejpeg($im2, '', param('image resize quality'));
			imagedestroy($im2);
			$imagedata = ob_get_contents();
			ob_end_clean();
			imagedestroy($im);
		} else {
			trigger_error('RESIZE IMAGE RECEIVED A NON-IMAGE PARAMETER');
		}
		return $imagedata;
	}
?>