Fatal error: Uncaught Error: Call to undefined function mysqli_connect() in C:\Wamp64\www\xades\plantillas_factura.php:9 Stack trace: #0 C:\Wamp64\www\xades\plantillas_factura.php(6): index() #1 {main} thrown in C:\Wamp64\www\xades\plantillas_factura.php on line 9