Warning: Undefined variable $DB in C:\php\hrd\manager_new\include\con_close.php on line 2

Fatal error: Uncaught Error: Call to a member function close() on null in C:\php\hrd\manager_new\include\con_close.php:2 Stack trace: #0 {main} thrown in C:\php\hrd\manager_new\include\con_close.php on line 2