Mine

function orta_resim($path)
{
        $size = getimagesize($path);
        $height = $size[1];
        $width = $size[0];
        if ($height > 50)
        {
                $height = 50;
                $percent = ($size[1] / $height);
                $width = ($size[0] / $percent);
        }else if ($width > 50)
        {
                $width = 50;
                $percent = ($size[0] / $width);
                $height = ($size[1] / $percent);
        }
        return "<img src=\"$path\" height=\"$height\" width=\"$width\">";
}