Warning: Undefined variable $db in /home/prosistemaapp/public_html/facturacion/obtener_folio.php on line 23

Fatal error: Uncaught Error: Call to a member function where() on null in /home/prosistemaapp/public_html/facturacion/obtener_folio.php:23 Stack trace: #0 {main} thrown in /home/prosistemaapp/public_html/facturacion/obtener_folio.php on line 23