WP_Widget::_register_one( int $number = -1 )

Source

public function _register_one( $number = -1 ) {
	wp_register_sidebar_widget(
		$this->id,
		$this->name,
		$this->_get_display_callback(),
		$this->widget_options,
		array( 'number' => $number )
	);

	_register_widget_update_callback(
		$this->id_base,
		$this->_get_update_callback(),
		$this->control_options,
		array( 'number' => -1 )
	);

	_register_widget_form_callback(
		$this->id,
		$this->name,
		$this->_get_form_callback(),
		$this->control_options,
		array( 'number' => $number )
	);
}

View all references View on Trac View on GitHub