How to find the highest value in a multidimensional array?

Question

I have following array:

$ar3 = array(123, array(12, 665, array(77, 255, 98, 56), 8), 1155, 676);

I need to compare all of its elements with

Answer 1

@Koiten below is your answer make correct your code according to below one:

OUTPUT: 1155