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Posted by Steve on 12/31/07 04:05
"Jerry Stuckle" <jstucklex@attglobal.net> wrote in message
news:V9idndyZVKOozOXanZ2dnUVZ_qPinZ2d@comcast.com...
> Steve wrote:
>> "Jerry Stuckle" <jstucklex@attglobal.net> wrote in message
>> news:mJidnRYAhdsKJO7anZ2dnUVZ_sbinZ2d@comcast.com...
>>> Steve wrote:
>>>> "Michael Fesser" <netizen@gmx.de> wrote in message
>>>> news:0hlim3hgb5p7ifm2o13pjm6q4l0q5jhiim@4ax.com...
>>>>> .oO(Logos)
>>>>>
>>>>>> On Dec 13, 3:16 pm, Michael Fesser <neti...@gmx.de> wrote:
>>>>>>
>>>>>>> At least when working with objects. But nevertheless
>>>>>>>
>>>>>>> $foo = new Test();
>>>>>>> $a = $foo;
>>>>>>> $b = &$foo;
>>>>>>>
>>>>>>> are still different things, even in PHP 5. In some particular
>>>>>>> situations
>>>>>>> this might become an issue.
>>>>>> Oooo...errr...ummm...could someone explain how exactly those are
>>>>>> different when using PHP5, then, please? If everything is done by
>>>>>> reference for objects, then to me $a and $b both look like pointers
>>>>>> to
>>>>>> an object.
>>>>> Don't confuse pointers with references, they are entirely different
>>>>> things. PHP doesn't know pointers.
>>>>>
>>>>> And correctly spoken objects in PHP 5 are _not_ passed by reference
>>>>> (at
>>>>> least it's not what PHP calls a reference), even if it's still
>>>>> mentioned
>>>>> that way on many websites. But it's wrong.
>>>>>
>>>>> Internally objects are represented by a handle (a simple number),
>>>>> which
>>>>> is what is moved around when you assign objects to variables, copy
>>>>> them
>>>>> or pass them to a function. You're never working directly with the
>>>>> object itself, but with its handle. Of course usually you won't notice
>>>>> that, because it's handled transparently by PHP.
>>>> michael, for people who come from a c/c++ background, what you've
>>>> described is *exactly* a pointer. the only difference in php is that
>>>> rather than the handle pointing to a memory address where information
>>>> is stored, this php handle points to a symbol table entry where
>>>> information is stored.
>>>>
>>> Wrong again, Stevie. A C++ pointer is not the same as a C++ reference.
>>> And C doesn't have references, just as PHP doesn't have pointers.
>>>
>>>> in php, a reference (or byref) behaves *IDENTICALLY* to a c/c++
>>>> pointer. there are somethings that you cannot do with this reference in
>>>> php that you could in other languages, however, the nature of the beast
>>>> is the same. i know that a reference in php is really just an alias of
>>>> the symbol table entry, but really that just seems a matter of
>>>> symantics to me. i don't care where things are stored at such a low
>>>> level when i'm writing in a scripting language. i care about behaviors.
>>>>
>>> Wrong again. They behave much differently.
>>
>> read, jerry, read. show me how in *PHP* the behavior is different. you've
>> tried before and failed. i'm not talking about the differences in
>> c/c++/c# (as they *are* different there)...we're talking about php.
>
> Stoopid. Show me where PHP has pointers. It doesn't.
>
> And you're the one who claimed that references and pointers behave
> identically in C/C++. Wrong again.
nope...i just said they were different in c, c++, and c#. i said for *PHP*
the behavior is essentially the same. i never said php had pointers...but
that the behavioral description is similar to pointers...and gave the
caveats about the actual terms and definitions so that is was clear that
there is technical difference.
learn to read.
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