一些帮助根据权限分解代码

Question

Morning,

with this code (symfony mask builder)

     MASK_VIEW         = 1;          // 1 << 0
     MASK_CREATE       = 2;          // 1 << 1
     MASK_EDIT         = 4;          // 1 << 2
     MASK_DELETE       = 8;          // 1 << 3
     MASK_UNDELETE     = 16;         // 1 << 4
     MASK_OPERATOR     = 32;         // 1 << 5
     MASK_MASTER       = 64;         // 1 << 6
     MASK_OWNER        = 128;

for a given resource,i store permission (int) by additionning theses permissions,with a basic example, i add: view, create, edit, will give 7.

So my question is how to "split" this 7 to retrieve thoses granted permissions.

i have a working code, with "if" and "else", but that's just ugly, so any "beautiful mind" would help on this ?

Answer 1

This not something you will do it with split but with bitwise operartor. Just chek this out:

• Permissions Using Bitwise.

If the values are coming from database you also can refer to:

• Implementation of User permission with PHP & Mysql Bitwise operators.