public function isPermitted( $permission ) {

		if( is_string( $permission ) ) {

			return in_array( $permission, $this->permissions );
		}
		else {

			$permitted = false;

			foreach( $permission as $perm ) {

				if( in_array( $perm, $this->permissions ) ) {

					$permitted = true;

					break;
				}
			}

			return $permitted;
		}
	}