public $cache_handler = 'file';
public $cachetime = '15';
public $caching = '0';
public $captcha = '0';
public $cookie_domain = '';
public $cookie_path = '';
public $db = 'database_name';

grep -F -r "public $db" --include="configuration.php"

/folder1/configuration.php: public $db = "db1";
/folder2/configuration.php: public $db = "db2";
/folder3/configuration.php: public $db = "db3";