Re: Constant and expression ?

On 19 May 2010 11:21, Tjerk Anne Meesters <datibbaw@php.net> wrote: > On Wed, May 19, 2010 at 5:52 PM, Frederic Hardy > <frederic.hardy@mageekbox.net> wrote: >> Hello ! >>> >>> AFAIK class constants are optimized for speed and therefore don't >>> support expressions; don't expect this to change any time soon ;-) >>> >>>> Is there any feature request about constant and expression ? >>>> I would like to write something like that : >>>> >>>> <?php >>>> >>>> namespace foo\bar\directories { >>>>    const tmp = __DIR__ . '/tmp'; >>>> } >>>> >>>> ?> >> >> So the best solution is something like <?php >> define('foo\bar\directories\tmp', __DIR__ . '/tmp'); ?>... >> It 's strange that "define()" function can do something that the >> "const" >>  keyword can't do, even if "const" keyword evaluation is done at >> compilation >> time and "define()" evaluation is done at runtime. > > That's why there's a cost penalty to using define(). > > I wrote a small article that gives an idea of the speed differences: > http://shwup.blogspot.com/2010/04/about-constants.html > > >> >> Best regards, >> Fred. >> >> -- >> ======================================================================== >> Frédéric Hardy : Architecte d'application/Admin. système/Ergonome >>        Status : En recherche d'emploi >> ======================================================================== >> >> > > > > -- > -- > Tjerk With regard to HiDef and the hidef.ini_path setting, and the comment on [1] regarding "However, all this goodness comes with a drawback: configuration settings are instance wide, which impacts all setups of PHP that runs beyond a single web request (e.g. Apache module or FastCGI).", could the ini entry be placed in a ... [HOST=] section in the ini file? [2] If so, could this be the best solution? Regards, Richard. [1] http://shwup.blogspot.com/2010/04/about-constants.html [2] http://docs.php.net/manual/en/ini.sections.php -- ----- Richard Quadling "Standing on the shoulders of some very clever giants!" EE : http://www.experts-exchange.com/M_248814.html EE4Free : http://www.experts-exchange.com/becomeAnExpert.jsp Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731 ZOPA : http://uk.zopa.com/member/RQuadling