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Date: Thu, 7 Jun 2012 12:53:44 -0700 (PDT)
Reply-To: Adi Mutu <adi_mutu06@yahoo.com>
To: =?iso-8859-1?Q?Johannes_Schl=FCter?= <johannes@schlueters.de>
Cc: Felipe Pena <felipensp@gmail.com>,
  PHP Developers Mailing List <internals@lists.php.net>
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Subject: Re: [PHP-DEV] concatenation operator
From: adi_mutu06@yahoo.com (Adi Mutu)

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Ok Johannes, thanks for the answer. I'll try to look deeper.=A0=0AI basical=
ly just wanted to know what happens when you concatenate two strings? what =
emalloc/efree happens.=0A=0AAlso can you tell me if possible how to put a b=
reakpoint to emalloc/efree which are executed only after all core functions=
 are registered? because it takes like a million years like this and a mill=
ion F8 presses...=0A=0AThanks.=0A=0A=0A________________________________=0A =
From: Johannes Schl=FCter <johannes@schlueters.de>=0ATo: Adi Mutu <adi_mutu=
06@yahoo.com> =0ACc: Felipe Pena <felipensp@gmail.com>; PHP Developers Mail=
ing List <internals@lists.php.net> =0ASent: Thursday, June 7, 2012 10:44 PM=
=0ASubject: Re: [PHP-DEV] concatenation operator=0A =0AOn Thu, 2012-06-07 a=
t 11:50 -0700, Adi Mutu wrote:=0A> =0A> that's nice, but i haven't understo=
od a thing...i know something about=0A> php core and php extensions, but no=
thing about the Zend engine=0A> specific. =0A=0AThe mentioned place is dire=
ctly in the VM, which in general is harder to=0Aunderstand, but well, it di=
rects to the "concat_function" on=0Ahttp://lxr.php.net/xref/PHP_TRUNK/Zend/=
zend_operators.c#1234=0A=0AKnowing basic C should be enough to understand t=
he code there. The=0Aactual "algorithm" can also easily be guessed (allocat=
e a buffer which=0Acan hold both strings at once and copy them over,the cod=
e is a tiny bit=0Amore complex as it tries tore use an existing buffer than=
 allocating=0Asomething completely new)=0A=0AThe question is: What do you a=
ctually want to know?=0A=0A> Can you point me to some resources on this top=
ic?=0A=0AUnfortunately not. The source is the best documentation we have fo=
r=0Athat.=0A=0Ajohannes=0A=0A=0A=0A-- =0APHP Internals - PHP Runtime Develo=
pment Mailing List=0ATo unsubscribe, visit: http://www.php.net/unsub.php
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