WordPress at a glance
function is not described

WP_Widget::__construct() public WP 2.8.0

PHP5 constructor.

{} It's a method of the class: WP_Widget{}

No Hooks.

Return

null. Nothing.

Usage

$WP_Widget = new WP_Widget();
$WP_Widget->__construct( $id_base, $name, $widget_options, $control_options );
$id_base(string) (required)
Base ID for the widget, lowercase and unique. If left empty, a portion of the widget's class name will be used. Has to be unique.
$name(string) (required)
Name for the widget displayed on the configuration page.
$widget_options(array)
Widget options. See wp_register_sidebar_widget() for information on accepted arguments.
Default: empty array
$control_options(array)
Widget control options. See wp_register_widget_control() for information on accepted arguments.
Default: empty array

Changelog

Since 2.8.0 Introduced.

Code of WP_Widget::__construct() WP 5.7.2

<?php
public function __construct( $id_base, $name, $widget_options = array(), $control_options = array() ) {
	$this->id_base         = empty( $id_base ) ? preg_replace( '/(wp_)?widget_/', '', strtolower( get_class( $this ) ) ) : strtolower( $id_base );
	$this->name            = $name;
	$this->option_name     = 'widget_' . $this->id_base;
	$this->widget_options  = wp_parse_args(
		$widget_options,
		array(
			'classname'                   => $this->option_name,
			'customize_selective_refresh' => false,
		)
	);
	$this->control_options = wp_parse_args( $control_options, array( 'id_base' => $this->id_base ) );
}