How to normalize an array in php?

Question

Algorithms

I have a formula to normalize a data vector in the range -1 to 1
The R package has a standard function data.Normalization
n5 - normalization in range <-1,1> ((x-mean)/max(abs(x-mean) ))
but I can't figure out how to program it in php,
does anyone know what the mean is, what should he do?

Answer 1

mean