On Thu, 2002-03-07 at 11:23, Markus Fischer wrote:
> On Thu, Mar 07, 2002 at 08:02:17PM +0100, [EMAIL PROTECTED] wrote :
> > On Thu, 7 Mar 2002, Andrey Hristov wrote:
> >
> > > You probably do:
> > > $some_len = strlen(&$some_str);
> >
> > right.
> >
> > > you do not need to use &. Probably $some_str is passed by reference
> > > without &.
> >
> > What do you mean by probably? I mean, the reason for me to use the
> > call-by-reference is the performance...
> >
> > I'm not on php-dev, so please reply to my personal adress ;)
>
> The not obvious thing is that references _are not_ faster. It
> is was Andi always has told us and it is what people said who
> did testing. Testings were posted to this list a while ago
> and performance of references was also discussed in the
> german php newsgroup. PHP is not C; references are
> not like C pointers; they are not faster.
This was my understanding too, until I tested it a few seconds ago. But
when I created a large string and did the following:
<?php
error_reporting(E_ALL);
$bigstring = implode("\n",
file('/home/torben/work/phpdoc/en/appendices/reserved.xml'));
function with_ref() {
global $bigstring, $with_ref_len;
$with_ref_len = strlen(&$bigstring);
}
function without_ref() {
global $bigstring, $without_ref_len;
$without_ref_len = strlen($bigstring);
}
speedtest(array('with_ref', 'without_ref'), 1000);
echo "With Ref len: $with_ref_len; Without ref len: $without_ref_len\n";
?>
I got:
Warning: Call-time pass-by-reference has been deprecated - argument
passed by value; If you would like to pass it by reference, modify the
declaration of strlen(). If you would like to enable call-time
pass-by-reference, you can set allow_call_time_pass_reference to true in
your INI file. However, future versions may not support this any longer.
in /home/torben/public_html/phptest/__phplist.html on line 22
Running with_ref() 1000 times...
0.064337968826294 seconds
Running without_ref() 1000 times...
18.39444899559 seconds
Results:
with_ref_1: 0.064337968826294
without_ref_2: 18.39444899559
With Ref len: 448490; Without ref len: 448490
...which seems to indicate that under some circumstances passing by
ref is indeed much faster. I could be missing something though--I
haven't had breakfast yet and I'm not too smart in the morning. :)
Cheers,
Torben
--
Torben Wilson <[EMAIL PROTECTED]>
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