Dreamweaver cs6

CS6 is 10+ year old software.  It's sorely outdated, discontinued and unsupported.  Why are you using obsolete software and coding methods?  Learning this won't help you.  It's counterproductive. The deprecated code you're using now won't work on modern servers running PHP 7 or higher.  DO NOT USE.

1. Get  a modern code editor. See links below. 

2. Learn to code manually with MySQLi (improved) or PDO.  

• https://www.w3schools.com/php/php_ref_mysqli.asp
• https://www.php.net/manual/book.mysqli.php
• https://www.php.net/manual/ref.pdo-mysql.php

CODE EDITORS/IDES:
-- Adobe Dreamweaver CC - https://www.adobe.com/products/dreamweaver.html

-- PHP Storm (PHP IDE) - https://www.jetbrains.com/phpstorm/

-- CodeLobster (free PHP IDE) - https://codelobsteride.com/
-- Codespaces (free, browser-based) - https://github.com/features/codespaces
-- Nova (Mac only, formerly called Coda) - https://nova.app/
-- Pinegrow - https://pinegrow.com/
-- Sublime Text - http://www.sublimetext.com/
-- Visual Studio Code (free) - https://code.visualstudio.com/
-- Wappler ~ Visual Web App Builder - https://wappler.io/

Hope that helps.

You most likely wont understand BUT the Dreamweaver server behaviours are outdated and were removed from recent versions of Dreamweaver (or at least 'hidden' by default). The server behaviours won't work on any server running php 7+ I think, although I can't exactly remember........it's that long ago. So the question would be what version of php are you trying to get the Dreamweaver server behaviours to run on?

The advice would be forget it and move on because you're using a workflow which is years behind the time. You should now either manually code your connection and queries to your database or buy into a third party extension - Adobe never updated there's to be compatible with newer versions of php as they used the old sql connection/query protocol and we now have advanced to the sqli  'improved' protocol.