Any idea why this isn't working? jm-svr is the local DNS name of the Synology box Apache 2.4 server. I have swapped out the DNS name for localhost and for the IP address
$DB = mysqli_connect("jm-svr", "UserName_Here", "Password_Here", "DB_Name_Here");
DB server MariaDB10.3.21.0063
PHP error message: Fatal error: Uncaught Error: Call to undefined function mysqli_connect()