Fix for deprecated syntax

[satopian]

• if(!isset($DNSBLservers[0])||!$DNSBLservers[0]) An undefined array will be null with an error, so if it is undefined, set it to False.

• Using ${} in strings is deprecated. ${value} → {$value}

• Declare an undeclared class property.

• https://www.php.net/manual/en/functions.arguments.php

  Note that any optional arguments should be specified after any required arguments, otherwise they cannot be omitted from calls.

• Checkd the existence of the image file before getimagesize($dest) to avoid errors when posting text-only in PHP8.x.

I hope it continues to work properly after these changes. It's working in my XAMPP test environment.

[kaguy4]

It continues to work after these changes. It also solves some of the issues the software was writing to the error.log file too. Thanks again!