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

Paul Taulborg wrote:

On Fri, Sep 20, 2013 at 10:01 AM, ruben <ruben.santacruz@gmail.com> 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.