Question

I grant permissions for persons like this:

$ARR_PERSON = array(
     2 => "Person B",
     4 => "Person C",
     8 => "Person D",
     16 => "Person E",
     32 => "Person F",
    );

The problem is I don’t know how to get the permission when I have a number. For example: 24. How to split it into 8 and 16? I can’t think out the solution.

Answer 1

Using bitwise operations. When PERMISSION & MASK is nonzero (e.g, 24 & 16), the flag is set. When it is zero, the flag is not set.