The license provided by Phprunner is a complete license of the product and to everyone's astonishment, the product has a fatstic and impressive amount of possibilities and excellent documentation on its website.
I have created some examples to exploit all these possibilities. It is something more complex to use but the results are impressive.
Tnx for your feedback, i will certainly check your example code. For the meantime i've solved it by getting the $get values and use the filters to create a total of the values i need.