Create a QR Code using PHP and Google

createqrcode.php

function createQR($url,$size ='150',$evLevel='L',$margin='0') {
   $url = urlencode($url);
   return '<img src="http://chart.apis.google.com/chart?chs=' . $size . 'x' . $size . '&cht=qr&chld=' . $evLevel . '|' . $margin . '&chl=' . $url . '" alt="QR code" width="' . $size . '" height="' . $size . '"/>';
}

echo createQR('http://www.wickedbrilliant.com',150);