WP_REST_Global_Styles_Controller::prepare_item_for_database() WordPress Method

	protected function prepare_item_for_database( $request ) {
		$changes     = new stdClass();
		$changes->ID = $request['id'];

		$post            = get_post( $request['id'] );
		$existing_config = array();
		if ( $post ) {
			$existing_config     = json_decode( $post->post_content, true );
			$json_decoding_error = json_last_error();
			if ( JSON_ERROR_NONE !== $json_decoding_error || ! isset( $existing_config['isGlobalStylesUserThemeJSON'] ) ||
				! $existing_config['isGlobalStylesUserThemeJSON'] ) {
				$existing_config = array();
			}
		}

		if ( isset( $request['styles'] ) || isset( $request['settings'] ) ) {
			$config = array();
			if ( isset( $request['styles'] ) ) {
				$config['styles'] = $request['styles'];
			} elseif ( isset( $existing_config['styles'] ) ) {
				$config['styles'] = $existing_config['styles'];
			}
			if ( isset( $request['settings'] ) ) {
				$config['settings'] = $request['settings'];
			} elseif ( isset( $existing_config['settings'] ) ) {
				$config['settings'] = $existing_config['settings'];
			}
			$config['isGlobalStylesUserThemeJSON'] = true;
			$config['version']                     = WP_Theme_JSON::LATEST_SCHEMA;
			$changes->post_content                 = wp_json_encode( $config );
		}

		// Post title.
		if ( isset( $request['title'] ) ) {
			if ( is_string( $request['title'] ) ) {
				$changes->post_title = $request['title'];
			} elseif ( ! empty( $request['title']['raw'] ) ) {
				$changes->post_title = $request['title']['raw'];
			}
		}

		return $changes;
	}