Warning: Undefined variable $mysqli in /home/mpa/public_html/adm/views/view_event_receipt.php on line 2

Fatal error: Uncaught Error: Call to a member function prepare() on null in /home/mpa/public_html/adm/views/view_event_receipt.php:2 Stack trace: #0 {main} thrown in /home/mpa/public_html/adm/views/view_event_receipt.php on line 2