me['settings'] );

			// Make sure we will save only settings that are present in the default theme.
			$settings = array_intersect_key( $settings, $default_theme['settings'] );

			// Sanitize settings.
			$sanitized_themes[ $slug ]['settings'] = array_map( 'sanitize_text_field', $settings );
		}

		return $sanitized_themes;
	}

	/**
	 * Update custom themes data.
	 *
	 * @since 1.8.8
	 *
	 * @param array $custom_themes Custom themes data.
	 *
	 * @return bool
	 */
	public function update_custom_themes_file( array $custom_themes ): bool {

		// Sanitize custom themes data to be saved.
		$sanitized_themes = $this->sanitize_custom_themes_data( $custom_themes );

		// Determine custom themes file path.
		$themes_file = $this->get_custom_themes_file_path();
		$json_data   = ! empty( $sanitized_themes ) ? wp_json_encode( $sanitized_themes ) : '{}';

		// Save custom themes data and return the result.
		return File::put_contents( $themes_file, $json_data );
	}
}