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Inheritance (extending classes) is realised in PHP with extends keyword: class albumController extends MfStandardController { Now, object of class albumController will be of type albumController, but also of type MfStandardController, because MfStandardController is a parent of this class

You can call constructor of the superclass of your class. Why to do that? It's important if you write your own constructor. If you derive from a class and write custom constructor then, when object is creating o only yours constructor will be called. This can casue a situation, when object isn't propably initialised. For example, some fields can be not set, null valued etc. To prevent those situations it is a good practice to call parent construtor in your class constructor as the first line like example below: public function __construct() { parent::__construct( 11 ); } In this situation you prevents errors like uninitialised class variables, uncalled other initialisation methods etc. As you can see, there is also a posibility to pass some variables to parent conscturctor. This is common case - if you derive from a class, wich have some variables in constructor, then you have to pass those variables in parent constructor call. If you are afraid, that some developer who wil...

You can access property of an object in php by opeartor ->.Just place it after a object variable, but remeber that accessed property must have valid access like private/protected/public.You can't access a private or protected object property from outside of a class or subclass.Item that you are accessing have to be public. You can access protected properties from subclasses and private properties if you are working with class wich have that property.Here is example how to access a public property in a object: class Sample { public $value; } $object = new Sample(); $object->value = 8; Remeber that good practice says to use getter and setter methods. If your project at some point will needa refactor that accessing some variable needs additional action then you can just change get or set method for that varaible.