statistical curve fitting with php

[Gondwana]

Hi everyone,
I need to fit somekind of a log curve to a series of data, and ideally I should do it in PHP.
I have an array with 2000 values of time from start in sec (index) and light intensity (value). These values are not smooth (steps). I need to compare these values to the ones generated by some know log functions or variants and see which is the best curve that descibe the data I have. When the proper curve is selected, I need to modify each value of the array to be on the curve in order to obtain a smoother curve.
I have not yet come across any script or class that does that.
I don't know where to start... can someone help me please?
Paul

[Bjom]

Wouldn't that be a job for R statistics .

Could be just me, but that doesn't sound like a project for rolling your own solutions...

Bjom

[Gondwana]

This R project sounds the big answer, but I am afraid too big for me unless someone can guide me through for my specific needs...
Anyway I have downloaded the package, installed and I am going through the examples.
Thank you for the suggestions