Generate QR Code with PHP

function createQR($url,$s ='200',$er='L',$b='0') {
   $url = urlencode($url);
   return '<img src="http://chart.apis.google.com/chart?chs=' . $s . 'x' . $size . '&cht=qr&chld=' . $er . '|' . $b . '&chl=' . $url . '" alt="TAG" width="' . $size . '" height="' . $size . '"/>';
}

echo createQR('http://www.yourdomain.com',200);