Welcome,
I’ve just created a brand new category here name basic php and I got my chance to explain you guys how you may include external php files into another ones. There are ways and ways but I will explain only two of them, the most popular ones. The first one, is called include() a php function which you may use it for simple things. I wouldn’t use it for a database connection, for that, exists the require_once() function. The difference between those two php functions is that include() function will give you a warning if the remote include file doesn’t exists. On the other side , the require_once() php function will stop parsing the script if the remote file wont be finded.
The usage is very basic like that
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<?php
include('filename.php');
//or
require_once('mydb.php');
?>
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