In this DevX tutorial, Octavia Anghel shows how use PHP to create images based on the SVG libraries available to any browser.

Scalable Vector Graphics (SVG) is an XML specification for producing vector-based graphic content that you can create, modify, and manipulate dynamically from programming languages. Here, you'll explore the most important techniques and libraries for integrating SVG with PHP to create diverse graphic content'"from simple shapes to complex graphs.

They show a few different ways to get the job done including a straight 'echo' call with the output, sending a converted SVG document over with a PHP header or including another (or multiple) SVG documents into another and outputting them. They also talk about tools like the phpHtmlLib library, the PEAR::XML_SVG package and the PEAR::Image_Canvas package.

Kore Nordmann has written up some benchmarks of some of the more popular PHP image creation libraries testing their output times and results for generating the same image.

In my article series I showed several ways on how to create images with PHP, going into implementation details etc. Now I just want to provide a very rough overview on speed and quality of the extensions.

He ran them with some settings disabled to optimize things as they ran and came up with results pointing to Cairo being the fastest to generate and output the image. It also had the benefit of outputting an image with the highest quality of the five tested (Cairo, SVG, Flash and GD with and without supersampling). His benchmark code is also included.