Great tool by Matthias Mullie, to analyzing your PHP code (in the screenshot above you can see the analysis of
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 →