need small change in my code

hello i need small change in my code oop code id like this public function __construct($config){ parent::__construct(); $this->config=$config; if(empty($this->config["key"])){ die("AAPI key is required to run this app."); } $this->set($this->config["key"]); } $config = array( "key" => "AIzaSyCnHxaMBkGMtIzqRdiY0BBthrWBptgMIZI", ); i need some change in my code like this $config = array( "key" => "[login to view URL]", );