Libchart Chart Creation Library 1.2 was recently released. Libchart is a chart creation PHP library that can generate bar and line diagrams or piecharts. It's compatible with PHP5 (compiled with GD and FreeType) and requires no other dependency. This new version features multiple datasets for horizontal, vertical bar charts and line charts.p>

Libchart is released under the terms of the GPL.

Project homepage:
http://naku.dohcrew.com/libchart

Demo site:
http://naku.dohcrew.com/libchart/pages/samplecode/