GraPHPite

Open Source PHP OO Graph Rendering out of the box has a name: GraPHPite, which is pronounced "graphite", as in the layered hexagonal structure of carbon, and it is an acronym of Graph and PHP and 'ite to make it pronouncable. GraPHPite as is indicated by the title a PHP project to, via PHP's object oriented model, simply but very customizable enable the user/developer to get exactly the look and feel they want.

Features
GraPHPite functionality includes:

GraPHPite Demonstration Many chart types
Many types of data source
Many charts displayed in the same graph
Gradient colored filling
Image masked filling
Every line, every color, every font can be customized
Output as PNG or JPEG
Support for PHP5
...and much more, when we get around to it ;o)
[more features...]

Requirements
The only system requirement is:
PHP4 or PHP5 support with GD 2 support for optimal performance
GD 1.x is supported with minor functionality tradeofs

Download
GraPHPite has been released as version 1.2, which can be downloaded from SourceForge: Download

Documentation
Documentation can be found in the release package and here on the web: Documentation