php - Inserting placeholders and radio button in SQL table -

i have problem can't seem solve.

$query = 'insert members (username,password,email,active,owner_service) values ( )';         $stmt = $db->prepare($query);         $stmt->bind_param( );         $stmt->execute(array(             ':username' => $_post['username'],             ':password' => $hashedpassword,             ':email' => $_post['email'],             ':active' => $activasion,             '"$owner_service"' => $post_['owner_service']         )); 

'username, password, email , active' placeholders 'owner_service' radio button , don't know how write in code if want insert table. use ' :xx ' placeholders , ' ? ' radio button? code

(:username, :password, :email, :active, ?) 

and in bind_param write

('$owner_service') ?