gistfile1.php

class MyClass extends Configurable {
    
    protected static $_defaults = array (
      "option1" => "blah blah blah",
      "option2" => 35,
      "option3" => true
    );
    
    public function __construct($param, $options = null)
    {
        
        parent::__construct($options);
        
        // do whatever else you want to do in the constructor here
        //
        
    }    
    
    public function test() {
        print_r ($this->getOptions());
    }
    
}


class MySubClass extends MyClass {
    
    protected static $_defaults = array (
      "option2" => 7453,
      "option4" => "Yes we can!"
    );
        
}


$myClass = new MyClass("I am a param", Array ("option2" => 542));
$mySubClass = new MySubClass("I am a param", Array ("option1" => "la la la la la"));

$myClass->test();
// Array ( [option1] => blah blah blah [option2] => 542 [option3] => 1 )

$mySubClass->test();
// Array ( [option1] => la la la la la [option2] => 7453 [option3] => 1 [option4] => Yes we can! )