Re: Re: Performance update involving zval containers. Whynot possible?

From: Date: Sat, 21 Sep 2013 17:29:54 +0000
Subject: Re: Re: Performance update involving zval containers. Whynot possible?
References: 1 2 3 4  Groups: php.internals 
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Paul Taulborg wrote:

On Fri, Sep 20, 2013 at 10:01 AM, ruben <[email protected]> wrote:


Pascal Chevrel wrote:


Le 20/09/2013 14:06, ruben a écrit :


Hi,

first of all I want to say that I am just a newbie in PHP. I am
switching to PHP from other languages and I am exploring how PHP manages
references. To do that I am gathering information about what happens
with Symbol Tables and Variables Containers when using references. You
know: reference-counting, copy-on-write and all that stuff...

I found out some cases where I think that some Variable Containers
copies could be skipped, thus saving memory and improving performance
relying in the copy-on-write principle. I wrote a PDF trying to explain
what I mean. It is not written in a very techy language, because I am
just new and don't know too much about the internals, but I hope you can
understand it and post your comments.

Probably if my "update" hasn't been done yet, is because it is not
possible, but I will very glad to hear your comments and learn from you.

Thank you very much.



Hi Ruben,

I think you forgot to put a link to your pdf :)

Regards,

Pascal



Sorry, here it is:
https://www.dropbox.com/s/wxdc99miw82zje9/PHP_references.pdf



Change the function to:
  function & do_something(& $s) {

and it should do what you are expecting, reusing a single reference.

http://www.php.net/manual/en/language.references.return.php for more
reference.



Yes, Paul. Thanks for your answer. But the function I wrote is only a sample code of a function receiving a parameter by reference. It is a different situation from the one you propose.

To be clear, I am not asking how to get what I am expecting, because I am not expecting anything. Only showing a behaviour that I think could be optimized and I don't know why it isn't.

Regards,

Ruben.

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