Class::$template_dir_path=get_template_directory();

get_template_directory is a helper function to be used in themes. it returns the complete path of theme directory.

advantage?

require_once get_template_directory().'some-function.php';

got it?

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)