wp_dashboard_setup

function wp_dashboard_setup() {
	global $wp_registered_widgets, $wp_registered_widget_controls, $wp_dashboard_control_callbacks;
	$wp_dashboard_control_callbacks = array();
	$screen                         = get_current_screen();

	/* Register Widgets and Controls */

	$response = wp_check_browser_version();

	if ( $response && $response['upgrade'] ) {
		add_filter( 'postbox_classes_dashboard_dashboard_browser_nag', 'dashboard_browser_nag_class' );
		if ( $response['insecure'] ) {
			wp_add_dashboard_widget( 'dashboard_browser_nag', __( 'You are using an insecure browser!' ), 'wp_dashboard_browser_nag' );
		} else {
			wp_add_dashboard_widget( 'dashboard_browser_nag', __( 'Your browser is out of date!' ), 'wp_dashboard_browser_nag' );
		}
	}

	// PHP Version.
	$response = wp_check_php_version();
	if ( $response && isset( $response['is_acceptable'] ) && ! $response['is_acceptable'] && current_user_can( 'update_php' ) ) {
		add_filter( 'postbox_classes_dashboard_dashboard_php_nag', 'dashboard_php_nag_class' );
		wp_add_dashboard_widget( 'dashboard_php_nag', __( 'PHP Update Required' ), 'wp_dashboard_php_nag' );
	}

	// Site Health.
	if ( current_user_can( 'view_site_health_checks' ) && ! is_network_admin() ) {
		if ( ! class_exists( 'WP_Site_Health' ) ) {
			require_once ABSPATH . 'wp-admin/includes/class-wp-site-health.php';
		}

		WP_Site_Health::get_instance();

		wp_enqueue_style( 'site-health' );
		wp_enqueue_script( 'site-health' );

		wp_add_dashboard_widget( 'dashboard_site_health', __( 'Site Health Status' ), 'wp_dashboard_site_health' );
	}

	// Right Now.
	if ( is_blog_admin() && current_user_can( 'edit_posts' ) ) {
		wp_add_dashboard_widget( 'dashboard_right_now', __( 'At a Glance' ), 'wp_dashboard_right_now' );
	}

	if ( is_network_admin() ) {
		wp_add_dashboard_widget( 'network_dashboard_right_now', __( 'Right Now' ), 'wp_network_dashboard_right_now' );
	}

	// Activity Widget.
	if ( is_blog_admin() ) {
		wp_add_dashboard_widget( 'dashboard_activity', __( 'Activity' ), 'wp_dashboard_site_activity' );
	}

	// QuickPress Widget.
	if ( is_blog_admin() && current_user_can( get_post_type_object( 'post' )->cap->create_posts ) ) {
		$quick_draft_title = sprintf( '<span class="hide-if-no-js">%1$s</span> <span class="hide-if-js">%2$s</span>', __( 'Quick Draft' ), __( 'Your Recent Drafts' ) );
		wp_add_dashboard_widget( 'dashboard_quick_press', $quick_draft_title, 'wp_dashboard_quick_press' );
	}

	// WordPress Events and News.
	wp_add_dashboard_widget( 'dashboard_primary', __( 'WordPress Events and News' ), 'wp_dashboard_events_news' );

	if ( is_network_admin() ) {

		/**
		 * Fires after core widgets for the Network Admin dashboard have been registered.
		 *
		 * @since 3.1.0
		 */
		do_action( 'wp_network_dashboard_setup' );

		/**
		 * Filters the list of widgets to load for the Network Admin dashboard.
		 *
		 * @since 3.1.0
		 *
		 * @param string[] $dashboard_widgets An array of dashboard widget IDs.
		 */
		$dashboard_widgets = apply_filters( 'wp_network_dashboard_widgets', array() );
	} elseif ( is_user_admin() ) {

		/**
		 * Fires after core widgets for the User Admin dashboard have been registered.
		 *
		 * @since 3.1.0
		 */
		do_action( 'wp_user_dashboard_setup' );

		/**
		 * Filters the list of widgets to load for the User Admin dashboard.
		 *
		 * @since 3.1.0
		 *
		 * @param string[] $dashboard_widgets An array of dashboard widget IDs.
		 */
		$dashboard_widgets = apply_filters( 'wp_user_dashboard_widgets', array() );
	} else {

		/**
		 * Fires after core widgets for the admin dashboard have been registered.
		 *
		 * @since 2.5.0
		 */
		do_action( 'wp_dashboard_setup' );

		/**
		 * Filters the list of widgets to load for the admin dashboard.
		 *
		 * @since 2.5.0
		 *
		 * @param string[] $dashboard_widgets An array of dashboard widget IDs.
		 */
		$dashboard_widgets = apply_filters( 'wp_dashboard_widgets', array() );
	}

	foreach ( $dashboard_widgets as $widget_id ) {
		$name = empty( $wp_registered_widgets[ $widget_id ]['all_link'] ) ? $wp_registered_widgets[ $widget_id ]['name'] : $wp_registered_widgets[ $widget_id ]['name'] . " <a href='{$wp_registered_widgets[$widget_id]['all_link']}' class='edit-box open-box'>" . __( 'View all' ) . '</a>';
		wp_add_dashboard_widget( $widget_id, $name, $wp_registered_widgets[ $widget_id ]['callback'], $wp_registered_widget_controls[ $widget_id ]['callback'] );
	}

	if ( 'POST' === $_SERVER['REQUEST_METHOD'] && isset( $_POST['widget_id'] ) ) {