How to convert byte array to integer in php?

Question

I have seen a code that converts integer into byte array. Below is the code on How to convert integer to byte array in php 3 (How to conver

Answer 1

Since L is four bytes long, you know the number of elements of the array. Therefore you can simply perform the operation is reverse:

$ar = [64,226,1,0];
$i = unpack("L",pack("C*",$ar[3],$ar[2],$ar[1],$ar[0]));