Re: [Phpgroupware-developers] i++ versus ++i

[Joseph Engo]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Very intresting ... I will make a note of using preincrements from now
on.  I don't think we should change all the code for it, but if you
see something
in a section of code you are working on, might as well go ahead and
change it.

Chris Weiss wrote:

| So I did a benchmark, 100 iteration of 100,000 increments and
averaged them.
| The pre-increment is .004 seconds faster on average on P4 2.24Ghz
using php
| 4.3.1 CLI that comes with Mandrake 9.1.
|
| So there's about a 40 nanosecond difference between the two with
| ++$i
being
| faster.
|
| http://cw.darktech.org/cw/test.phps
|
| You might also be interested to know that if I didn't preload $i to
|
100000 in
| a loop first it adds .003 seconds to the first loop.
|
| Chris Weiss (address@hidden) wrote:
|
|> http://www.faqts.com/knowledge_base/view.phtml/aid/1/fid/40 "echo
|> is marginally faster since it doesn't set a return value if you
|> really want to get down to the nitty gritty."
|>
|> I don't see any mention of speed difference in
|> http://us2.php.net/language.operators.increment.  If there are
really found to
|> be the data should be posted there.  It's quite possible though
|> that
will be
|> no difference.  Where is compiled the temp var is needed, but
|> sine
php is
|> interpreted it's possible that internanly there is a temp var in
both cases.
|>
|>
|> Joseph Engo (address@hidden) wrote:
|>

| Well, first off that page is for C++.  I am not sure if the same
| applys to PHP or not.  It would be interesting to research.
|
| This is the first I am hearing about echo vs print.  Honestly, what
|  are the differences if any ?  I have personally used echo since I
| started in PHP.  Why ?  I don't know, I guess to be different from
| the other languages I use.
|
| Joseph Engo
|
| Chris Weiss wrote:
|
| |noted.  IMO not worth chnaging old code unless you're redoing that
| area |anyway.  It's very a minimal cost (kind of like echo vs
| print) and changing it |any places where it's used inline will
| intruduce bugs. | |Kai Hofmann (address@hidden) wrote: |
| |>Just for info, why it is better to use ++$i instead of $i++ |>
| |>source: http://www.gotw.ca/gotw/002.htm |> |>Preincrement is more
| efficient than postincrement, because for postincrement |>the
| object must increment itself and then return a temporary containing
| its |>old value. Note that this is true even for builtins like int!
|  |> |>[Guideline] Prefer preincrement, avoid postincrement. |> |>
| |> |>Have a happy weekend. |> |>  Kai/PowerStat |> |>-- |>*****
| Open Source und Linux im professionellen Einsatz    ***** |>**
| komplexe Mailserver, Groupware, Office: sprechen Sie uns an **
| |>Dipl.-Inform. Kai Hofmann                    Team
| Softwarelösungen |>pro|business AG, EXPO Plaza 1 (Deutscher
| Pavillon), 30539 Hannover |>E-Mail: address@hidden,
| Tel.: 0511/60066-332, Fax: -355 |>WWW: http://www.probusiness.de/
| |> |> |> |>_______________________________________________
| |>Phpgroupware-developers mailing list
| |>address@hidden
| |>http://mail.gnu.org/mailman/listinfo/phpgroupware-developers |> |
|  | | |_______________________________________________
| |Phpgroupware-developers mailing list
| |address@hidden
| |http://mail.gnu.org/mailman/listinfo/phpgroupware-developers
|
|

_______________________________________________
Phpgroupware-developers mailing list
address@hidden
http://mail.gnu.org/mailman/listinfo/phpgroupware-developers

|>
|>
|> _______________________________________________
|> Phpgroupware-developers mailing list
|> address@hidden
|> http://mail.gnu.org/mailman/listinfo/phpgroupware-developers
|>



| _______________________________________________
| Phpgroupware-developers mailing list
| address@hidden
| http://mail.gnu.org/mailman/listinfo/phpgroupware-developers


-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.3 (MingW32)
Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org

iD8DBQFAJBOB/AzmiD/o0voRAsfoAJoDwWIPLcLC51KwLMmCLn6DXDehdwCgk9r+
qDYC7kCduVzNykp/dCxy/sc=
=7gYc
-----END PGP SIGNATURE-----