WP_Compat::using_block_function()

	public static function using_block_function() {
		if ( 2 !== self::$blocks_compatibility_level ) {
			return;
		}

		$trace = debug_backtrace();

		/*
		 * Fires after WP_Compat::using_block_function() is called.
		 *
		 * @since: CP-2.0.0
		 *
		 * @param array $trace debug_backtrace() output
		 */
		do_action( 'using_block_function', $trace );

		if ( str_starts_with( $trace[1]['file'], realpath( get_stylesheet_directory() ) ) ) {
			// Current theme is calling the function
			update_option( 'theme_using_blocks', '1' );
		} elseif ( str_starts_with( $trace[1]['file'], realpath( get_template_directory() ) ) ) {
			// Parent theme is calling the function
			update_option( 'theme_using_blocks', '2' );
		} else {
			// A plugin is calling the function
			$traces = array_column( $trace, 'file' );
			$traces = array_map(
				function ( $path ) {
					return self::plugin_folder( $path );
				},
				$traces
			);
			$active = wp_get_active_and_valid_plugins();
			$active = array_map(
				function ( $path ) {
					return self::plugin_folder( $path );
				},
				$active
			);
			$plugins = array_intersect( $traces, $active );
			$plugin = array_pop( $plugins );
			if ( null === $plugin ) {
				// Nothing found? Bail.
				return;
			}
			$plugins_using_blocks = get_option( 'plugins_using_blocks', array() );
			if ( ! array_key_exists( plugin_basename( $plugin ), $plugins_using_blocks ) ) {
				$plugins_using_blocks[ plugin_basename( $plugin ) ] = true;
				update_option( 'plugins_using_blocks', $plugins_using_blocks );
			}
		}
	}