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Posted by Steve on 12/31/07 02:15
"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.
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