image resize

gistfile1.txt

if ($image_w < $image_h)
{
	//portrait
	$height = $max_height;
	$width = round( $height*($image_w/$image_h) );
}
if($image_w => $image_h)
{
	//landscape
	if($image_h < ($image_w/2))
	{
		//resize by width
		$width = $max_width;
		$height = round( $width*($image_h/$image_w) );

	}
	else
	{
		//resize by height
		$height = $max_height;
		$width = round( $height*($image_w/$image_h) );
	}
}