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Posted by Tony Marston on 11/30/06 11:02
"Jerry Stuckle" <jstucklex@attglobal.net> wrote in message
news:n9GdnZYmX_-4EfDYnZ2dnUVZ_q-dnZ2d@comcast.com...
> Tony Marston wrote:
>> "Jerry Stuckle" <jstucklex@attglobal.net> wrote in message
>> news:bpudnWTDrLPbNPHYnZ2dnUVZ_tudnZ2d@comcast.com...
>>
>>>Tony Marston wrote:
>>>
>>>>"Jerry Stuckle" <jstucklex@attglobal.net> wrote in message
>>>>news:PeudnRKltLJsufHYnZ2dnUVZ_u2dnZ2d@comcast.com...
>>>>
>>>>
>>>>>Tony Marston wrote:
>>>>>
>>>>>
>>>>>>"Jerry Stuckle" <jstucklex@attglobal.net> wrote in message
>>>>>>news:j9-dnQB80fVLOvbYnZ2dnUVZ_rOdnZ2d@comcast.com...
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Tony Marston wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>"Jerry Stuckle" <jstucklex@attglobal.net> wrote in message
>>>>>>>>news:Ib6dna_BtYQSifbYnZ2dnUVZ_sSdnZ2d@comcast.com...
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>>jopperdepopper wrote:
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>>>You should read "can be accessed everywhere".
>>>>>>>>>>>
>>>>>>>>>>>Private members can be accessed by members of the class only.
>>>>>>>>>>>Protected members can be accessed by members of the class or a
>>>>>>>>>>>derived
>>>>>>>>>>>class.
>>>>>>>>>>>Public members can be accessed by anyone, including other
>>>>>>>>>>>classes,
>>>>>>>>>>>functions and any other code.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>Thanks Jerry. I'm trying to make a bit of sense of the php 5
>>>>>>>>>>approach
>>>>>>>>>>to classes, and so far having a hard time. I fail to see the 'why'
>>>>>>>>>>behind the 'public, protected and private' and stuff like
>>>>>>>>>>abstraction,
>>>>>>>>>>interfaces and whatnot.
>>>>>>>>
>>>>>>>>
>>>>>>>>Intefaces are not necessary in PHP. Once you have defined a method
>>>>>>>>it is a total waste to time to also define an interface. Interfaces
>>>>>>>>are a "fix" in those languages as a means of dealing with optional
>>>>>>>>arguments and statyic typing. PHP has ifferent ways of dealing with
>>>>>>>>bth of these, therefore interfaces serve no useful purpose.
>>>>>>>>
>>>>>>>
>>>>>>>Ah, the great Tony Marston is back to trolling again.
>>>>>>>
>>>>>>>Wrong. In OO terms, the interface is the way to interact with the
>>>>>>>object. It consists of all public members - both methods (functions,
>>>>>>>in PHP) and variables. And for derived classes, the base class adds
>>>>>>>protected members.
>>>>>>>
>>>>>>>A PHP interface is something entirely different.
>>>>>>
>>>>>>
>>>>>>I disagree. It is possible to define a function (method) within a
>>>>>>class,
>>>>>>then to define a separate thing called an "interface". It is possible
>>>>>>access
>>>>>>the function without using the interface, therefore the interface is
>>>>>>not
>>>>>>necessary.
>>>>>>
>>>>>
>>>>>Tony,
>>>>>
>>>>>You really need to learn about OO before spouting off. In OO terms, an
>>>>>interface is something entirely different than a PHP interface.
>>>>
>>>>
>>>>How so? All the documentation I have seen describes how an interface
>>>>simply describes a method which it imlements. If it is possible to
>>>>access a method (a function in PHP) without going though an interface,
>>>>ten an interface is not necessary in any language.
>>>>
>>>
>>>You need to understand the difference between an interface as described
>>>in OO terms and the PHP interface.
>>>
>>>The PHP interface defines a set of methods (function) which are required
>>>by the classes which implement the interface. Java is similar in that
>>>respect. But both are a subset of the total interface.
>>
>>
>> It is possible to access the method directly without an interface,
>> therefore an interfae is not necessary.
>>
>
> "Possible" != "CORRECT"
That's just your opinion. Where does it say that I *MUST* define and use an
interface before I can access a class method? Interfaces are optional
(especuially in PHP) so it is not wrong to excercise the option NOT to use
them. I can define a class method and access that method without using an
interface, and that is what I choose to do.
--
Tony Marston
http://www.tonymarston.net
http://www.radicore.org
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