PHP Warnings for array_keys() and in_array()

Thanks Gavin. The answer is quite simple: Restrict Widgets is not multisite compatible yet, but we added that feature to our to-do list as you can see here https://www.dfactory.eu/plugins/restrict-widgets/

I just ran across this on my multi-site. The way I fixed it was to edit the ‘restrict_sidebar_params’ function in ‘restrict-widgets.php’ by adding in a few more checks to the variables being used.

/**
	 * Hides widgets for users without admin privileges
	*/
	public function restrict_sidebar_params($params)
	{
		if(!current_user_can('manage_options'))
		{
			global $wp_registered_widgets;

			$option = get_option('rw_widgets_options');

			$widgetid = $params[0]['widget_id'];
			$callback = $wp_registered_widgets[$widgetid]['callback'][0];
			$registeredid = $wp_registered_widgets[$widgetid]['id'];
			$callback_class = get_class($callback);
			$available = $option['available'];

			if( isset($widgetid) && (

				//standard based widget class
				(isset($callback) && is_object($callback) && isset($callback_class) && isset($available) && in_array($callback_class, array_keys($available))) ||

				//non-standard based widget
				(isset($registeredid) && isset($available) && in_array($registeredid, array_keys($available)))
			))
				$params[0]['_hide'] = 1;
		}

		return $params;
	}

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