private static function _load_file() {
		$t_array = file( __DIR__ . '/../../data/domains.txt' );
		$t_result_array = array();

		foreach ( $t_array as $t_line ) {
			$t_entry = trim( $t_line );
			if ( empty( $t_entry ) ) {
				continue;
			}

			# Exclude commented lines
			if ( strpos( $t_entry, '#' ) === 0 ) {
				continue;
			}

			$t_domain = strtolower( $t_entry );
			$t_result_array[$t_domain] = true;
		}

		return $t_result_array;
	}