how often will public function __construct() run?

Thanks. In that case, where should I place "run-once" type activities, such as opening databases and loading session variables? BTW, I am getting up to the point where I am going to need to fully test my application and have never set up testing before. Now I know there are different types of testing (over 20 different kinds). What type of testing does your book address? Also, I am having trouble with Composer. Does that preclude using your testing procedure?

proof that an old dog can learn new tricks