Great tool by Matthias Mullie, to analyzing your PHP code (in the screenshot above you can see the analysis of ansi-php):
Figure out complexity hotspots in the blink of an eye from a couple of very simple charts [generated by Cauditor]. The charts will help you understand the architecture of the project & make it easier to keep it under control.
On his website you can also find some accompanying posts on how the datapoints are measured.
Cauditor: Visualize your code architecture. Discover complexity hotspots. →
Measuring software complexity →
Measuring software coupling →