ser_data() {
		if ( null !== static::$user && static::has_same_registered_blocks( 'user' ) ) {
			return static::$user;
		}

		$config   = array();
		$user_cpt = static::get_user_data_from_wp_global_styles( wp_get_theme() );

		if ( array_key_exists( 'post_content', $user_cpt ) ) {
			$decoded_data = json_decode( $user_cpt['post_content'], true );

			$json_decoding_error = json_last_error();
			if ( JSON_ERROR_NONE !== $json_decoding_error ) {
				trigger_error( 'Error when decoding a theme.json schema for user data. ' . json_last_error_msg() );
				/**
				 * Filters the data provided by the user for global styles & settings.
				 *
				 * @since 6.1.0
				 *
				 * @param WP_Theme_JSON_Data $theme_json Class to access and update the underlying data.
				 */
				$theme_json = apply_filters( 'wp_theme_json_data_user', new WP_Theme_JSON_Data( $config, 'custom' ) );
				$config     = $theme_json->get_data();
				return new WP_Theme_JSON( $config, 'custom' );
			}

			/*
			 * Very important to verify that the flag isGlobalStylesUserThemeJSON is true.
			 * If it's not true then the content was not escaped and is not safe.
			 */
			if (
				is_array( $decoded_data ) &&
				isset( $decoded_data['isGlobalStylesUserThemeJSON'] ) &&
				$decoded_data['isGlobalStylesUserThemeJSON']
			) {
				unset( $decoded_data['isGlobalStylesUserThemeJSON'] );
				$config = $decoded_data;
			}
		}

		/** This filter is documented in wp-includes/class-wp-theme-json-resolver.php */
		$theme_json   = apply_filters( 'wp_theme_json_data_user', new WP_Theme_JSON_Data( $config, 'custom' ) );
		$config       = $theme_json->get_data();
		static::$user = new WP_Theme_JSON( $config, 'custom' );

		return static::$user;
	}

	/**
	 * Returns the data merged from multiple origins.
	 *
	 * There are four sources of data (origins) for a site:
	 *
	 * - default => WordPress
	 * - blocks  => each one of the blocks provides data for itself
	 * - theme   => the active theme
	 * - custom  => data provided by the user
	 *
	 * The custom's has higher priority than the theme's, the theme's higher than blocks',
	 * and block's higher than default's.
	 *
	 * Unlike the getters
	 * {@link https://developer.wordpress.org/reference/classes/wp_theme_json_resolver/get_core_data/ get_core_data},
	 * {@link https://developer.wordpress.org/reference/classes/wp_theme_json_resolver/get_theme_data/ get_theme_data},
	 * and {@link https://developer.wordpress.org/reference/classes/wp_theme_json_resolver/get_user_data/ get_user_data},
	 * this method returns data after it has been merged with the previous origins.
	 * This means that if the same piece of data is declared in different origins
	 * (default, blocks, theme, custom), the last origin overrides the previous.
	 *
	 * For example, if the user has set a background color
	 * for the paragraph block, and the theme has done it as well,
	 * the user preference wins.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added user data, removed the `$settings` parameter,
	 *              added the `$origin` parameter.
	 * @since 6.1.0 Added block data and generation of spacingSizes array.
	 * @since 6.2.0 Changed ' $origin' parameter values to 'default', 'blocks', 'theme' or 'custom'.
	 *
	 * @param string $origin Optional. To what level should we merge data: 'default', 'blocks', 'theme' or 'custom'.
	 *                       'custom' is used as default value as well as fallback value if the origin is unknown.
	 * @return WP_Theme_JSON
	 */
	public static function get_merged_data( $origin = 'custom' ) {
		if ( is_array( $origin ) ) {
			_deprecated_argument( __FUNCTION__, '5.9.0' );
		}

		$result = new WP_Theme_JSON();
		$result->merge( static::get_core_data() );
		if ( 'default' === $origin ) {
			$result->set_spacing_sizes();
			return $result;
		}

		$result->merge( static::get_block_data() );
		if ( 'blocks' === $origin ) {
			return $result;
		}

		$result->merge( static::get_theme_data() );
		if ( 'theme' === $origin ) {
			$result->set_spacing_sizes();
			return $result;
		}

		$result->merge( static::get_user_data() );
		$result->set_spacing_sizes();

		return $result;
	}

	/**
	 * Returns the ID of the custom post type
	 * that stores user data.
	 *
	 * @since 5.9.0
	 *
	 * @return integer|null
	 */
	public static function get_user_global_styles_post_id() {
		if ( null !== static::$user_custom_post_type_id ) {
			return static::$user_custom_post_type_id;
		}

		$user_cpt = static::get_user_data_from_wp_global_styles( wp_get_theme(), true );

		if ( array_key_exists( 'ID', $user_cpt ) ) {
			static::$user_custom_post_type_id = $user_cpt['ID'];
		}

		return static::$user_custom_post_type_id;
	}

	/**
	 * Determines whether the active theme has a theme.json file.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added a check in the parent theme.
	 * @deprecated 6.2.0 Use wp_theme_has_theme_json() instead.
	 *
	 * @return bool
	 */
	public static function theme_has_support() {
		_deprecated_function( __METHOD__, '6.2.0', 'wp_theme_has_theme_json()' );

		return wp_theme_has_theme_json();
	}

	/**
	 * Builds the path to the given file and checks that it is readable.
	 *
	 * If it isn't, returns an empty string, otherwise returns the whole file path.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Adapted to work with child themes, added the `$template` argument.
	 *
	 * @param string $file_name Name of the file.
	 * @param bool   $template  Optional. Use template theme directory. Default false.
	 * @return string The whole file path or empty if the file doesn't exist.
	 */
	protected static function get_file_path_from_theme( $file_name, $template = false ) {
		$path      = $template ? get_template_directory() : get_stylesheet_directory();
		$candidate = $path . '/' . $file_name;

		return is_readable( $candidate ) ? $candidate : '';
	}

	/**
	 * Cleans the cached data so it can be recalculated.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added the `$user`, `$user_custom_post_type_id`,
	 *              and `$i18n_schema` variables to reset.
	 * @since 6.1.0 Added the `$blocks` and `$blocks_cache` variables
	 *              to reset.
	 */
	public static function clean_cached_data() {
		static::$core                     = null;
		static::$blocks                   = null;
		static::$blocks_cache             = array(
			'core'   => array(),
			'blocks' => array(),
			'theme'  => array(),
			'user'   => array(),
		);
		static::$theme                    = null;
		static::$user                     = null;
		static::$user_custom_post_type_id = null;
		static::$i18n_schema              = null;
	}

	/**
	 * Returns an array of all nested JSON files within a given directory.
	 *
	 * @since 6.2.0
	 *
	 * @param string $dir The directory to recursively iterate and list files of.
	 * @return array The merged array.
	 */
	private static function recursively_iterate_json( $dir ) {
		$nested_files      = new RecursiveIteratorIterator( new RecursiveDirectoryIterator( $dir ) );
		$nested_json_files = iterator_to_array( new RegexIterator( $nested_files, '/^.+\.json$/i', RecursiveRegexIterator::GET_MATCH ) );
		return $nested_json_files;
	}


	/**
	 * Returns the style variations defined by the theme.
	 *
	 * @since 6.0.0
	 * @since 6.2.0 Returns parent theme variations if theme is a child.
	 *
	 * @return array
	 */
	public static function get_style_variations() {
		$variation_files    = array();
		$variations         = array();
		$base_directory     = get_stylesheet_directory() . '/styles';
		$template_directory = get_template_directory() . '/styles';
		if ( is_dir( $base_directory ) ) {
			$variation_files = static::recursively_iterate_json( $base_directory );
		}
		if ( is_dir( $template_directory ) && $template_directory !== $base_directory ) {
			$variation_files_parent = static::recursively_iterate_json( $template_directory );
			// If the child and parent variation file basename are the same, only include the child theme's.
			foreach ( $variation_files_parent as $parent_path => $parent ) {
				foreach ( $variation_files as $child_path => $child ) {
					if ( basename( $parent_path ) === basename( $child_path ) ) {
						unset( $variation_files_parent[ $parent_path ] );
					}
				}
			}
			$variation_files = array_merge( $variation_files, $variation_files_parent );
		}
		ksort( $variation_files );
		foreach ( $variation_files as $path => $file ) {
			$decoded_file = wp_json_file_decode( $path, array( 'associative' => true ) );
			if ( is_array( $decoded_file ) ) {
				$translated = static::translate( $decoded_file, wp_get_theme()->get( 'TextDomain' ) );
				$variation  = ( new WP_Theme_JSON( $translated ) )->get_raw_data();
				if ( empty( $variation['title'] ) ) {
					$variation['title'] = basename( $path, '.json' );
				}
				$variations[] = $variation;
			}
		}
		return $variations;
	}
}
<br />
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