How to Generate QR Code with PHP Using Google API

<?
$urlToEncode="http://superiorwebsys.com";
generateQRwithGoogle($urlToEncode);
function generateQRwithGoogle($chl,$widhtHeight ='150',$EC_level='L',$margin='0') {
    $url = urlencode($url);
    echo '<img src="http://chart.apis.google.com/chart?chs='.$widhtHeight.

'x'.$widhtHeight.'&cht=qr&chld='.$EC_level.'|'.$margin.

'&chl='.$chl.'" alt="QR code" widhtHeight="'.$size.

'" widhtHeight="'.$size.'"/>';
}
?>