array( 'count' => array( 'type' => 'number', 'default' => 0, ), ), 'render_callback' => static function ( $attributes ) { $count = isset( $attributes['count'] ) ? absint( $attributes['count'] ) : 0; // Simulate an empty response when count is over maximum value = 10. if ( $count > 10 ) { return ''; } return sprintf( '

Coffee count: %d

', $count ); }, 'editor_script_handles' => array( 'server-side-rendered-block' ), ) ); } );