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

What is the role of bitwise AND and bitwise OR in the development process of PHP?

/**
 * 1. Permission application
 * For which permissions you have, add up the values ​​corresponding to these permissions
 * 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)
 * Then compare [sum of permission values] with [actual permission value] [located]
 * If the result is true, you have permission
 * If the result is false, you have no permission
 *
 * Note: permissions The value must be the Nth power of 2, starting from the 0th power. The 31st power is 2147483648
 * 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 )
 * Of course, if the storage format is bitint or varchar, which can store longer numbers, then the number of permissions can continue to increase
*/
$permission = 15; //1+2+4+8 has all permissions
$permissions = array(
 8 => 'Add',
 4 => 'Delete',
 2 => 'Modify',
 1 => 'Query'
);
foreach ($permissions as $key => $val) {
 if($key & $permission) {
 echo 'I have the power of ' . $val . '';
 }
}

Waiting to be added