f ( ! file_exists( $dirpath ) ) {
			if ( $can_use_cached ) {
				$this->set_pattern_cache( $pattern_data );
			}
			return $pattern_data;
		}
		$files = glob( $dirpath . '*.php' );
		if ( ! $files ) {
			if ( $can_use_cached ) {
				$this->set_pattern_cache( $pattern_data );
			}
			return $pattern_data;
		}

		$default_headers = array(
			'title'         => 'Title',
			'slug'          => 'Slug',
			'description'   => 'Description',
			'viewportWidth' => 'Viewport Width',
			'inserter'      => 'Inserter',
			'categories'    => 'Categories',
			'keywords'      => 'Keywords',
			'blockTypes'    => 'Block Types',
			'postTypes'     => 'Post Types',
			'templateTypes' => 'Template Types',
		);

		$properties_to_parse = array(
			'categories',
			'keywords',
			'blockTypes',
			'postTypes',
			'templateTypes',
		);

		foreach ( $files as $file ) {
			$pattern = get_file_data( $file, $default_headers );

			if ( empty( $pattern['slug'] ) ) {
				_doing_it_wrong(
					__FUNCTION__,
					sprintf(
						/* translators: 1: file name. */
						__( 'Could not register file "%s" as a block pattern ("Slug" field missing)' ),
						$file
					),
					'6.0.0'
				);
				continue;
			}

			if ( ! preg_match( '/^[A-z0-9\/_-]+$/', $pattern['slug'] ) ) {
				_doing_it_wrong(
					__FUNCTION__,
					sprintf(
						/* translators: 1: file name; 2: slug value found. */
						__( 'Could not register file "%1$s" as a block pattern (invalid slug "%2$s")' ),
						$file,
						$pattern['slug']
					),
					'6.0.0'
				);
			}

			// Title is a required property.
			if ( ! $pattern['title'] ) {
				_doing_it_wrong(
					__FUNCTION__,
					sprintf(
						/* translators: 1: file name. */
						__( 'Could not register file "%s" as a block pattern ("Title" field missing)' ),
						$file
					),
					'6.0.0'
				);
				continue;
			}

			// For properties of type array, parse data as comma-separated.
			foreach ( $properties_to_parse as $property ) {
				if ( ! empty( $pattern[ $property ] ) ) {
					$pattern[ $property ] = array_filter( wp_parse_list( (string) $pattern[ $property ] ) );
				} else {
					unset( $pattern[ $property ] );
				}
			}

			// Parse properties of type int.
			$property = 'viewportWidth';
			if ( ! empty( $pattern[ $property ] ) ) {
				$pattern[ $property ] = (int) $pattern[ $property ];
			} else {
				unset( $pattern[ $property ] );
			}

			// Parse properties of type bool.
			$property = 'inserter';
			if ( ! empty( $pattern[ $property ] ) ) {
				$pattern[ $property ] = in_array(
					strtolower( $pattern[ $property ] ),
					array( 'yes', 'true' ),
					true
				);
			} else {
				unset( $pattern[ $property ] );
			}

			$key = str_replace( $dirpath, '', $file );

			$pattern_data[ $key ] = $pattern;
		}

		if ( $can_use_cached ) {
			$this->set_pattern_cache( $pattern_data );
		}

		return $pattern_data;
	}

	/**
	 * Gets block pattern cache.
	 *
	 * @since 6.4.0
	 * @since 6.6.0 Uses transients to cache regardless of site environment.
	 *
	 * @return array|false Returns an array of patterns if cache is found, otherwise false.
	 */
	private function get_pattern_cache() {
		if ( ! $this->exists() ) {
			return false;
		}

		$pattern_data = get_site_transient( 'wp_theme_files_patterns-' . $this->cache_hash );

		if ( is_array( $pattern_data ) && $pattern_data['version'] === $this->get( 'Version' ) ) {
			return $pattern_data['patterns'];
		}
		return false;
	}

	/**
	 * Sets block pattern cache.
	 *
	 * @since 6.4.0
	 * @since 6.6.0 Uses transients to cache regardless of site environment.
	 *
	 * @param array $patterns Block patterns data to set in cache.
	 */
	private function set_pattern_cache( array $patterns ) {
		$pattern_data = array(
			'version'  => $this->get( 'Version' ),
			'patterns' => $patterns,
		);

		/**
		 * Filters the cache expiration time for theme files.
		 *
		 * @since 6.6.0
		 *
		 * @param int    $cache_expiration Cache expiration time in seconds.
		 * @param string $cache_type       Type of cache being set.
		 */
		$cache_expiration = (int) apply_filters( 'wp_theme_files_cache_ttl', self::$cache_expiration, 'theme_block_patterns' );

		// We don't want to cache patterns infinitely.
		if ( $cache_expiration <= 0 ) {
			_doing_it_wrong(
				__METHOD__,
				sprintf(
					/* translators: %1$s: The filter name.*/
					__( 'The %1$s filter must return an integer value greater than 0.' ),
					'<code>wp_theme_files_cache_ttl</code>'
				),
				'6.6.0'
			);

			$cache_expiration = self::$cache_expiration;
		}

		set_site_transient( 'wp_theme_files_patterns-' . $this->cache_hash, $pattern_data, $cache_expiration );
	}

	/**
	 * Clears block pattern cache.
	 *
	 * @since 6.4.0
	 * @since 6.6.0 Uses transients to cache regardless of site environment.
	 */
	public function delete_pattern_cache() {
		delete_site_transient( 'wp_theme_files_patterns-' . $this->cache_hash );
	}

	/**
	 * Enables a theme for all sites on the current network.
	 *
	 * @since 4.6.0
	 *
	 * @param string|string[] $stylesheets Stylesheet name or array of stylesheet names.
	 */
	public static function network_enable_theme( $stylesheets ) {
		if ( ! is_multisite() ) {
			return;
		}

		if ( ! is_array( $stylesheets ) ) {
			$stylesheets = array( $stylesheets );
		}

		$allowed_themes = get_site_option( 'allowedthemes' );
		foreach ( $stylesheets as $stylesheet ) {
			$allowed_themes[ $stylesheet ] = true;
		}

		update_site_option( 'allowedthemes', $allowed_themes );
	}

	/**
	 * Disables a theme for all sites on the current network.
	 *
	 * @since 4.6.0
	 *
	 * @param string|string[] $stylesheets Stylesheet name or array of stylesheet names.
	 */
	public static function network_disable_theme( $stylesheets ) {
		if ( ! is_multisite() ) {
			return;
		}

		if ( ! is_array( $stylesheets ) ) {
			$stylesheets = array( $stylesheets );
		}

		$allowed_themes = get_site_option( 'allowedthemes' );
		foreach ( $stylesheets as $stylesheet ) {
			if ( isset( $allowed_themes[ $stylesheet ] ) ) {
				unset( $allowed_themes[ $stylesheet ] );
			}
		}

		update_site_option( 'allowedthemes', $allowed_themes );
	}

	/**
	 * Sorts themes by name.
	 *
	 * @since 3.4.0
	 *
	 * @param WP_Theme[] $themes Array of theme objects to sort (passed by reference).
	 */
	public static function sort_by_name( &$themes ) {
		if ( str_starts_with( get_user_locale(), 'en_' ) ) {
			uasort( $themes, array( 'WP_Theme', '_name_sort' ) );
		} else {
			foreach ( $themes as $key => $theme ) {
				$theme->translate_header( 'Name', $theme->headers['Name'] );
			}
			uasort( $themes, array( 'WP_Theme', '_name_sort_i18n' ) );
		}
	}

	/**
	 * Callback function for usort() to naturally sort themes by name.
	 *
	 * Accesses the Name header directly from the class for maximum speed.
	 * Would choke on HTML but we don't care enough to slow it down with strip_tags().
	 *
	 * @since 3.4.0
	 *
	 * @param WP_Theme $a First theme.
	 * @param WP_Theme $b Second theme.
	 * @return int Negative if `$a` falls lower in the natural order than `$b`. Zero if they fall equally.
	 *             Greater than 0 if `$a` falls higher in the natural order than `$b`. Used with usort().
	 */
	private static function _name_sort( $a, $b ) {
		return strnatcasecmp( $a->headers['Name'], $b->headers['Name'] );
	}

	/**
	 * Callback function for usort() to naturally sort themes by translated name.
	 *
	 * @since 3.4.0
	 *
	 * @param WP_Theme $a First theme.
	 * @param WP_Theme $b Second theme.
	 * @return int Negative if `$a` falls lower in the natural order than `$b`. Zero if they fall equally.
	 *             Greater than 0 if `$a` falls higher in the natural order than `$b`. Used with usort().
	 */
	private static function _name_sort_i18n( $a, $b ) {
		return strnatcasecmp( $a->name_translated, $b->name_translated );
	}

	private static function _check_headers_property_has_correct_type( $headers ) {
		if ( ! is_array( $headers ) ) {
			return false;
		}
		foreach ( $headers as $key => $value ) {
			if ( ! is_string( $key ) || ! is_string( $value ) ) {
				return false;
			}
		}
		return true;
	}
}