Protect content from php files?

Question

I don’t know if I’m doing it right, but I have a file called Setting.php in my project, but I’m not sure that it is protected because it contains the login information of the Cpanel admin, so if someone has access to it they will have access to all the files and even DB, Should I change any permissions on that file? or just something like:

ini_set('display_errors',0);
ini_set('display_startup_erros',0);
function conectar(){
    try{
        $pdo=new PDO ("mysql:host=localhost;dbname=testlogin","root","");
    }catch(PDOException $e){
        echo $e->getMessage();
    }
    return $pdo;
}

Would be enough?