Question

I have a parent class:

Abstract Class Base {
    function __construct($registry) {
        // stuff
    }
}

I then have at least 2 classes that extend that class

class Cms extends Base {
   // a few functions here
}

and this one

class Index extends Base {
   // a few functions here
}

For the CMS class, the user will need to be logged in. Session has already been initiated and I want to check that the user is logged in by using a session var. So what I’d like to do is:

class Cms extends Base {
   function __construct()
   {
        // check the user session is valid
   }
   // a few functions here
}

but of course that will overwrite the parent construct class and everything it set. Is there a way to have a __construct() type method that can be defined in the child class?

Answer 1

From the child constructor, you can call the parent’s one :

class Cms extends Base {
   function __construct()
   {
       parent::__construct();
        // check the user session is valid
   }
   // a few functions here
}

See the examples on the Constructors and Destructors page of the manual, and the note (quoting) :

Note: Parent constructors are not
called implicitly if the child class
defines a constructor.
In order
to run a parent constructor, a call to
parent::__construct() within the
child constructor is required.