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Different uses of bitwise operations (bitwise AND, bitwise OR) in PHP

WBOY
WBOYOriginal
2016-07-25 09:12:121255browse
What is the role of bitwise AND and bitwise OR in the development process of PHP?
  1. /**
  2. * 1. Permission application
  3. * For which permissions you have, add up the values ​​corresponding to these permissions
  4. * For example: if the moderator has permissions (add, delete, modify, query), then the moderator's permission value is stored as 15 (8 +4+2+1)
  5. * Then compare [sum of permission values] with [actual permission value] [located]
  6. * If the result is true, you have permission
  7. * If the result is false, you have no permission
  8. *
  9. * Note: permissions The value must be the Nth power of 2, starting from the 0th power. The 31st power is 2147483648
  10. * The 32nd power is 4294967296, which has exceeded the common int (10) maximum storage of 4294967295, so you must pay attention to the number of permissions (<31 )
  11. * Of course, if the storage format is bitint or varchar, which can store longer numbers, then the number of permissions can continue to increase
  12. */
  13. $permission = 15; //1+2+4+8 has all permissions
  14. $permissions = array(
  15. 8 => 'Add',
  16. 4 => 'Delete',
  17. 2 => 'Modify',
  18. 1 => 'Query'
  19. );
  20. foreach ($permissions as $key => $val) {
  21. if($key & $permission) {
  22. echo 'I have the power of ' . $val . '
    ';
  23. }
  24. }
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