Re: concatenation operator

Ok Johannes, thanks for the answer. I'll try to look deeper.  I basically just wanted to know what happens when you concatenate two strings? what emalloc/efree happens. Also can you tell me if possible how to put a breakpoint to emalloc/efree which are executed only after all core functions are registered? because it takes like a million years like this and a million F8 presses... Thanks. ________________________________ From: Johannes Schlüter <johannes@schlueters.de> To: Adi Mutu <adi_mutu06@yahoo.com> Cc: Felipe Pena <felipensp@gmail.com>; PHP Developers Mailing List <internals@lists.php.net> Sent: Thursday, June 7, 2012 10:44 PM Subject: Re: [PHP-DEV] concatenation operator On Thu, 2012-06-07 at 11:50 -0700, Adi Mutu wrote: > > that's nice, but i haven't understood a thing...i know something about > php core and php extensions, but nothing about the Zend engine > specific. The mentioned place is directly in the VM, which in general is harder to understand, but well, it directs to the "concat_function" on http://lxr.php.net/xref/PHP_TRUNK/Zend/zend_operators.c#1234 Knowing basic C should be enough to understand the code there. The actual "algorithm" can also easily be guessed (allocate a buffer which can hold both strings at once and copy them over,the code is a tiny bit more complex as it tries tore use an existing buffer than allocating something completely new) The question is: What do you actually want to know? > Can you point me to some resources on this topic? Unfortunately not. The source is the best documentation we have for that. johannes -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php