Performance tips for finding unique permutation

Question

TLDR: how to find multidimensional array permutation in php and how to optimize for bigger arrays?

This is continuation of this question: how to fin

Answer 1

what you should try to use is called a Power set which is:

from wikipedia in mathematics, the power set (or powerset) of any set S is the set of all subsets of S, including the empty set and S itself, variously denoted as P(S),