Embellish is an open-source class for generating QR Codes. You are free to use it and modify it as you wish.
Create an instance of Embellish with the string for the QRCode as its parameter.
$anyvar = new Embellish("Hello World!");
Retrieve the image by using the getIMG() method.
echo '<img src="'.$anyvar->getIMG().'">';
##QR Code Generator
source - The server to be used to get the QRCodes
size - width/height of the image