keep track how many object in PHP4

[Andrew G. Koptyaev]

Please help.

I need to keep track of how many object of a given class without introducing
a non-class member variable. Which one of the following will allow me to do
this?

1) Add member variable that gets incremented in the default constructor and
decremented in the destructor.
2) Add local variable that gets incremented in the each constructor and
decremented in the destructor.
3) Add static member variable that gets incremented in the each constructor
and
decremented in the destructor.
4) This cannot be accomplished since the creation of objects is being done
dynamically via "new".

Thank you!

[C. (http://symcbean.blogspot.com/)]

Re: keep track how many object in PHP4

On 4 Sep, 17:22, "Andrew G. Koptyaev" <kopty...@gmail .comwrote:

Please help.
>
I need to keep track of how many object of a given class without introducing
a non-class member variable. Which one of the following will allow me to do
this?
>
1) Add member variable that gets incremented in the default constructor and
decremented in the destructor.
2) Add local variable that gets incremented in the each constructor and
decremented in the destructor.
3) Add static member variable that gets incremented in the each constructor
and
decremented in the destructor.
4) This cannot be accomplished since the creation of objects is being done
dynamically via "new".
>
Thank you!

Thank you for posting your homework / interview quiz here.

The correct answer is none of the above: use a factory to control
creation / destruction.

C.

[=?UTF-8?B?SXbDoW4gU8OhbmNoZXogT3J0ZWdh?=]

Re: keep track how many object in PHP4

Andrew G. Koptyaev wrote:

I need to keep track of how many object of a given class without
introducing a non-class member variable. Which one of the following will
allow me to do this?

Since this is obviously a question from a test, the correct answer
is "study".

--
----------------------------------
Iván Sánchez Ortega -ivan-algarroba-sanchezortega-punto-es-

"Los periódicos tradicionales ya están muertos (...) quieren dominar algo
que se les ha escapado de las manos. Tienen miedo de sus propias webs."
-- Gumersindo Lafuente, ex-director de Elmundo.es.

[Andrew G. Koptyaev]

Re: keep track how many object in PHP4


"Ivan Sanchez Ortega" <ivansanchez-alg@rroba-escomposlinux.-.punto.-.org>
ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ: news:g9p2uu$2t1 $1@hercules.coh p1...

Andrew G. Koptyaev wrote:
>

>I need to keep track of how many object of a given class without
>introducing a non-class member variable. Which one of the following will
>allow me to do this?

>
Since this is obviously a question from a test, the correct answer
is "study".

Please point me to corresponding article on www.php.net
Thank you.

[Erwin Moller]

Re: keep track how many object in PHP4


Andrew G. Koptyaev schreef:

"Ivan Sanchez Ortega" <ivansanchez-alg@rroba-escomposlinux.-.punto.-.org>
ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ: news:g9p2uu$2t1 $1@hercules.coh p1...

>Andrew G. Koptyaev wrote:
>>

>>I need to keep track of how many object of a given class without
>>introducing a non-class member variable. Which one of the following will
>>allow me to do this?

>Since this is obviously a question from a test, the correct answer
>is "study".

>
Please point me to corresponding article on www.php.net
Thank you.

Andrew,

You won't find an article on www.php.net describing this excact question.
It is like asking where on www.php.net you can find the answer to the
question: "How do I print 'dog' to the browser?".
You will find print and echo commands, but (probably) not:
echo "dog";

You can easily answer this question if you understand the difference
between instances and classes.
That is why Ivan advised you study a bit more, which is good advise.
Best of luck!

Regards,
Erwin Moller

--
=============== =============
Erwin Moller
Now dropping all postings from googlegroups.
Why? http://improve-usenet.org/
=============== =============

[=?UTF-8?B?SXbDoW4gU8OhbmNoZXogT3J0ZWdh?=]

Re: keep track how many object in PHP4

Andrew G. Koptyaev wrote:

Please point me to corresponding article on www.php.net

Here you are:

http://php.net/oop5

--
----------------------------------
Iván Sánchez Ortega -ivan-algarroba-sanchezortega-punto-es-

Tea. Earl grey. Hot.
-- Captain Jean-Luc Picard, from Star Trek.

[johannes.heinen@googlemail.com]

Re: keep track how many object in PHP4

On Sep 4, 7:03 pm, Iván Sánchez Ortega <ivansanchez-...@rroba-
escomposlinux.-.punto.-.orgwrote:

Andrew G. Koptyaev wrote:

Please point me to corresponding article onwww.php.net

>
Here you are:
>

http://php.net/oop5

>
--
----------------------------------
Iván Sánchez Ortega -ivan-algarroba-sanchezortega-punto-es-
>
Tea. Earl grey. Hot.
                                -- Captain Jean-Luc Picard, from Star Trek.

Hi,

the correct answer should be "(static) class variable" (not object
variable). You can easily increment this static variable in your
instance constructor. so you don't need any factory or other "more
complex" design patterns.

But your question really belongs to the very very low level basics of
object oriented concepts, so better read a school book about it (every
java for dummies handbook should do).

Have fun :)

[Andrew G. Koptyaev]

Re: keep track how many object in PHP4

Other word true is:

3) Add static member variable that gets incremented in the each constructor
and decremented in the destructor.

But it is php4 and no desctructor in language.

<johannes.heine n@googlemail.co m???????/???????? ? ???????? ?????????:
news:563906e8-3349-4415-ba2a-86876d4a0d47@y3 8g2000hsy.googl egroups.com...
On Sep 4, 7:03 pm, Iván Sánchez Ortega <ivansanchez-...@rroba-
escomposlinux.-.punto.-.orgwrote:

Andrew G. Koptyaev wrote:

Please point me to corresponding article onwww.php.net

>
Here you are:
>

http://php.net/oop5

>
--
----------------------------------
Iván Sánchez Ortega -ivan-algarroba-sanchezortega-punto-es-
>
Tea. Earl grey. Hot.
-- Captain Jean-Luc Picard, from Star Trek.

Hi,

the correct answer should be "(static) class variable" (not object
variable). You can easily increment this static variable in your
instance constructor. so you don't need any factory or other "more
complex" design patterns.

But your question really belongs to the very very low level basics of
object oriented concepts, so better read a school book about it (every
java for dummies handbook should do).

Have fun :)

[Andrew G. Koptyaev]

Re: keep track how many object in PHP4


"C. (http://symcbean.blogsp ot.com/)" <colin.mckinnon @gmail.com>
???????/???????? ? ???????? ?????????:
news:1820ad3e-eeea-420c-9a50-5edf63f3f3c0@25 g2000prz.google groups.com...

On 4 Sep, 17:22, "Andrew G. Koptyaev" <kopty...@gmail .comwrote:

>Please help.
>>
>I need to keep track of how many object of a given class without
>introducing
>a non-class member variable. Which one of the following will allow me to
>do
>this?
>>
>1) Add member variable that gets incremented in the default constructor
>and
>decremented in the destructor.
>2) Add local variable that gets incremented in the each constructor and
>decremented in the destructor.
>3) Add static member variable that gets incremented in the each
>constructor
>and
>decremented in the destructor.
>4) This cannot be accomplished since the creation of objects is being
>done
>dynamically via "new".
>>
>Thank you!

>
Thank you for posting your homework / interview quiz here.
>
The correct answer is none of the above: use a factory to control
creation / destruction.
>
C.

It is from test with one true. I must select one.

[Andrew G. Koptyaev]

Re: keep track how many object in PHP4


"Erwin Moller"
<Since_humans_r ead_this_I_am_s pammed_too_much @spamyourself.c om>
???????/???????? ? ???????? ?????????:
news:48c014a0$0 $184$e4fe514c@n ews.xs4all.nl.. .

>
Andrew G. Koptyaev schreef:

>"Ivan Sanchez Ortega" <ivansanchez-alg@rroba-escomposlinux.-.punto.-.org>
>ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ:
>news:g9p2uu$2t 1$1@hercules.co hp1...

>>Andrew G. Koptyaev wrote:
>>>
>>>I need to keep track of how many object of a given class without
>>>introducin g a non-class member variable. Which one of the following
>>>will
>>>allow me to do this?
>>Since this is obviously a question from a test, the correct answer
>>is "study".

>>
>Please point me to corresponding article on www.php.net
>Thank you.

>
Andrew,
>
You won't find an article on www.php.net describing this excact question.
It is like asking where on www.php.net you can find the answer to the
question: "How do I print 'dog' to the browser?".
You will find print and echo commands, but (probably) not:
echo "dog";
>
You can easily answer this question if you understand the difference
between instances and classes.
That is why Ivan advised you study a bit more, which is good advise.
Best of luck!
>
Regards,
Erwin Moller

I think I can't track instance because I can't share one variable between
instance. All member variables belong corresponding object.

[Jerry Stuckle]

Re: keep track how many object in PHP4

Andrew G. Koptyaev wrote:

"C. (http://symcbean.blogsp ot.com/)" <colin.mckinnon @gmail.com>
???????/???????? ? ???????? ?????????:
news:1820ad3e-eeea-420c-9a50-5edf63f3f3c0@25 g2000prz.google groups.com...

>On 4 Sep, 17:22, "Andrew G. Koptyaev" <kopty...@gmail .comwrote:

>>Please help.
>>>
>>I need to keep track of how many object of a given class without
>>introducing
>>a non-class member variable. Which one of the following will allow me to
>>do
>>this?
>>>
>>1) Add member variable that gets incremented in the default constructor
>>and
>>decremented in the destructor.
>>2) Add local variable that gets incremented in the each constructor and
>>decremented in the destructor.
>>3) Add static member variable that gets incremented in the each
>>constructor
>>and
>>decremented in the destructor.
>>4) This cannot be accomplished since the creation of objects is being
>>done
>>dynamically via "new".
>>>
>>Thank you!

>Thank you for posting your homework / interview quiz here.
>>
>The correct answer is none of the above: use a factory to control
>creation / destruction.
>>
>C.

>
It is from test with one true. I must select one.
>
>
>

Study up on the basics of OO design.

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attgl obal.net
=============== ===

[Jerry Stuckle]

Re: keep track how many object in PHP4

Andrew G. Koptyaev wrote:

"Erwin Moller"
<Since_humans_r ead_this_I_am_s pammed_too_much @spamyourself.c om>
???????/???????? ? ???????? ?????????:
news:48c014a0$0 $184$e4fe514c@n ews.xs4all.nl.. .

>Andrew G. Koptyaev schreef:

>>"Ivan Sanchez Ortega" <ivansanchez-alg@rroba-escomposlinux.-.punto.-.org>
>>ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ:
>>news:g9p2uu$2 t1$1@hercules.c ohp1...
>>>Andrew G. Koptyaev wrote:
>>>>
>>>>I need to keep track of how many object of a given class without
>>>>introduci ng a non-class member variable. Which one of the following
>>>>will
>>>>allow me to do this?
>>>Since this is obviously a question from a test, the correct answer
>>>is "study".
>>Please point me to corresponding article on www.php.net
>>Thank you.

>Andrew,
>>
>You won't find an article on www.php.net describing this excact question.
>It is like asking where on www.php.net you can find the answer to the
>question: "How do I print 'dog' to the browser?".
>You will find print and echo commands, but (probably) not:
>echo "dog";
>>
>You can easily answer this question if you understand the difference
>between instances and classes.
>That is why Ivan advised you study a bit more, which is good advise.
>Best of luck!
>>
>Regards,
>Erwin Moller

>
I think I can't track instance because I can't share one variable between
instance. All member variables belong corresponding object.
>
>
>

Erwin is correct. You can if you understand the difference between
instances and classes.

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attgl obal.net
=============== ===