Barcodes and QR codes in PHP

For a project I am working on right now, I needed to generate barcodes and QR codes. Looking around for solutions for the barcodes I quickly found Zend_Barcode (thanks to someone pointing me to it, by the way. I had not expected a barcode generator in Zend). For QR, it was slightly harder to find a good solution. A quick question on Twitter helped a lot. In the end, it boiled down to two options: PHP QR Code and using the Google Chart API.