Why should I use bitwise/bitmask in PHP?

Question

I am working on a user-role / permission system in PHP for a script.

Below is a code using a bitmask method for permissions that I found on phpbuilder.com.

B

Answer 1

Script checks which mask has been set in decimal. Maybe someone will need it:

Output (php maskChecker.php 123):

0
1 - SET,
2 - SET,
4
8 - SET,
16 - SET,
32 - SET,
64 - SET,
128
256
512
1024
2048
4096
8192
(...)

Sum of set mask: 123