Posted by Jerry Stuckle on 07/23/07 16:16

Sanders Kaufman wrote:
> Toby A Inkster wrote:
>> Sanders Kaufman wrote:
>>
>>> So extended (child?) classes MUST NOT (for OOP reasons) automatically
>>> call a constructor. Rather, it should be called manually, if and
>>> when it's desired.
>>
>> s/MUST NOT/DO NOT/
>>
>> Of course, if you don't define a __construct() method in the child
>> class, the parent class' constructor will get called automatically.
>>
>> Basically, in PHP __construct() behaves the same way other methods
>> do: if you define the method in a child class, the parent class'
>> method will be ignored, unless you explicitly call it from within
>> the child class' method (using "parent::method()").
>
> So to correct my statement:
>
> In OOP (not just PHP) the constructor of the grandest child :) will be
> called when a class is instantiated as an object.
>

True. And in true OO languages, the parent constructor(s) is(are)
called, also.

> Zat right?
>
> Vocabulary question: When I do this, what is the OOP thing that I'm
> doing? You said that my use of an object as a property of the parent
> class was "aggregation. So - when I use use "extends" to create the
> child's reference to the parent - wassat? Marshalling? Inheritance?
>
>

Inheritance.


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Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attglobal.net
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