public function update_question( $data = array() ) {

		// If there's no ID, we'll add a new question.
		if ( ! isset( $data['id'] ) ) {
			return $this->create_question( $data );
		}

		// Get the question.
		$question = $this->get_question( $data['id'] );
		if ( ! $question ) {
			return false;
		}

		// Update all submitted data.
		foreach ( $data as $key => $val ) {

			// Merge image data into the array.
			if ( 'image' === $key ) {
				$val = array_merge(
					array(
						'enabled' => 'no',
						'id'      => '',
						'src'     => '',
					),
					$question->get( $key ),
					$val
				);
			}

			$question->set( $key, $val );
		}

		// Return question ID.
		return $question->get( 'id' );

	}