QR Code generation using php

What are QR Codes?

QR codes look like UPC codes but they are capable of storing much more data as well as alphanumeric characters. You scan the codes with your mobile devices by snapping photos with a QR code reader.
QR codes are used by companies to market their businesses and extend the reach of their brands. When a customer/prospect scans the code with their mobile device, the code will reveal information the company adds to it. This information can be text or a link to a website or custom landing page. The marketing possibilities are endless.
How are marketers using QR codes? Here are some cool and inspiring uses and strategies:
Don’t forget to click the images for more information about QR codes!
http://www.tcpdf.org/examples.php
http://www.tcpdf.org/examples/example_050.pdf