Crashes in PHP 8; here’s the fix

This plugin is incompatible with PHP 8. To fix it, make these changes to the widgets.php file:

First, replace this:

function WIC_Widget_Divider() {
    $widget_ops = array('description' => __( 'New row of widgets', 'widget-in-columns' ) );
    $this->WP_Widget( "wic-divider", __( 'Divider', 'widget-in-columns' ), $widget_ops, null );
}

With this:

public function __construct() {
    $widget_ops = array(
        'description' => __( 'New row of widgets', 'widget-in-columns' ),
    );

    parent::__construct(
        'wic-divider',
        __( 'Divider', 'widget-in-columns' ),
        $widget_ops
    );
}

Next, replace this:

function WIC_Widget_Spacer() {
    $widget_ops = array('description' => __( 'Adds a blank column', 'widget-in-columns' ) );
    $this->WP_Widget( "wic-spacer", __( 'Spacer', 'widget-in-columns' ), $widget_ops, null );
}

With this:

public function __construct() {
    $widget_ops = array(
        'description' => __( 'Adds a blank column', 'widget-in-columns' ),
    );

    parent::__construct(
        'wic-spacer',
        __( 'Spacer', 'widget-in-columns' ),
        $widget_ops
    );
}

Optionally, replace this:

echo "<div class='{$instance[type]}'></div>";

With this:

$type = isset( $instance['type'] ) ? esc_attr( $instance['type'] ) : 'divider';
echo "<div class='{$type}'></div>";

That’s it!