作为其他类中的方法的结果，将方法作为带有键的数组传递

Question

I have two snippet codes like this:

class User()
{
    var $permission = array();

    function __construct()
    {
        $Permission_Class = new Permission();
        // What to do here with $this->permission 
        // to linked with $Permission_Class->check_permission() 
        // for getting user's permission?
    }
}

class Permission()
{
    var $permission_list = array(
        'can_read'    => 'yes',
        'can_write'   => 'no'
    );

    public function check_permission($permission_name)
    {
        return $this->permission_list[$permission_name];         
    }
}

I want to get the user's permission by simply entering the permission name as an array, especially by this:

$User1 = new User();
$read_permission = $User1->permission['can_read']; // not working currently

Or even more better like this:

$permission = $User1->permission();
var_dump($permission['can_read']); // expected 'yes'

So expected results is 'can_read' in class Permission has 'yes' value. What can I do to get this happen?

Thank you.

Answer 1

Easy, just wrap it up!

class User()
{
    private $permission = array();

    function __construct()
    {
        $this->permission = new Permission();
    }

    public function permission($key)
    {
         return $this->permission->check_permission($key);
    }
}

$user->permission('can_read');

Be sure to check if $key is an existing key. E.G:

/**
 * $default  would contain the value you want your 
 *           requested permission to have if it does not exist
 */
public function check_permission($permission_name, $default = NULL)
{
    return isset($this->permission_list[$permission_name])
        ? $this->permission_list[$permission_name]
        : $default;         
}

// We want can write to be `FALSE` unless otherwise specified
$user->permission('can_write', FALSE);

Update after comment

Event though I advice against using a global permissions array (e.g. what if you'd want to know whether another user has the can_write permission) you could rewrite some of it easily:

/** class User **/
public function permission($key = NULL)
{
     // If no key specified, return entire array
     if($key === NULL)
     {
        return $this->permission->permission_list;
     }

     return $this->permission->check_permission($key); 
}

Then somewhere in your application

global $permissions;
$permissions = $user->permission();