Barcode Maker
This PHP code creates Code 128A barcodes, readable by almost all conventional barcode scanners.
Download the PHP file here. You will need to copy a font file into your PHP directory or the text won't display. I use the font Arial Bold, which is copyrighted, so I haven't included it.
Barcode Maker by Geoff Lankow is licensed
under a Creative Commons Attribution 3.0 License.