public function getCreateMeta(
		array $project_ids = null,
		array $project_keys = null,
		array $issue_type_ids = null,
		array $issue_type_names = null,
		array $expand = null
	) {
		// Create comma separated query parameters for the supplied filters.
		$data = array();

		if ( $project_ids !== null ) {
			$data['projectIds'] = implode(',', $project_ids);
		}

		if ( $project_keys !== null ) {
			$data['projectKeys'] = implode(',', $project_keys);
		}

		if ( $issue_type_ids !== null ) {
			$data['issuetypeIds'] = implode(',', $issue_type_ids);
		}

		if ( $issue_type_names !== null ) {
			$data['issuetypeNames'] = implode(',', $issue_type_names);
		}

		if ( $expand !== null ) {
			$data['expand'] = implode(',', $expand);
		}

		return $this->api(self::REQUEST_GET, '/rest/api/2/issue/createmeta', $data, true);
	}