NYCPHP Meetup

[Rolan Yang]

Hrm.. I just ran a real world test and the results were drastically 
different.

With single quotes, it took about 3.4 seconds to complete.
With double quotes, 22  seconds on average.

My setup:
# php -v
PHP 5.1.6 (cli) (built: Nov  3 2006 07:27:53)
Zend Engine v2.1.0, Copyright (c) 1998-2006 Zend Technologies
AMD Athlon(tm) XP 2200+
1GB RAM

It would be interesting for you guys to share your results too.

Here is the code. Run it from the command line with: "php -f quotetest.php"
or load it in your browser.

<?php
// Test speed of double quotes vs single quotes
// Rolan Yang rolan at omnistep.com   4/10/2007

$insertthis="abcdefg";

if (isset($_SERVER['HTTP_USER_AGENT'])) {$newline="<br>\n";} else 
{$newline="\n";}
$start=microtime(TRUE);
print "Start: $start{$newline}";


for ($x=1;$x<5000000;$x++) {
        // comment out one of the two lines below when testing
        
#$test="aerg;jia;rgjia;erigja;ergja;rga;erigjae;rigjae;riogja;eriogjae;rgjae;riojga;erji{$insertthis}";
        
$test='aerg;jia;rgjia;erigja;ergja;rga;erigjae;rigjae;riogja;eriogjae;rgjae;riojga;erji'.$insertthis;
}
$end=microtime(TRUE);
print "End: $end{$newline}Total=".($end-$start).$newline;
?>


~Rolan


Paul M Jones wrote:
>
> On Apr 10, 2007, at 11:05 AM, Paul M Jones wrote:
>
>> On Apr 10, 2007, at 11:03 AM, Rahmin Pavlovic wrote:
>>
>>> Does anyone know approximately how much longer double-quotes take to 
>>> parse
>>> in a controlled environment?
>>
>> My understanding is "little if any"; recent versions of PHP 4 have 
>> eliminated the time-difference in single/double quote parsing.
>
> In fact, here's a blog entry about it from Sara Golemon:
>
>   
> <http://blog.libssh2.org/index.php?/archives/28-How-long-is-a-piece-of-string.html> 
>
>
> See comments 4 and 4.1 for the specific answer:
>
>> Definitely a very interesting article.
>> It would also be nice to know whether there is a difference between 
>> single and double quotes because there is always a lot of discussion 
>> going on about that, too. (and i don't know how to find out the 
>> opcodes and stuff ;-) )
>> #4 Jan on 2006-06-19 10:19 (Reply)
> ...
>> Short version: No. The margin between single and double quoted is on 
>> the order of nanoseconds. The only thing that gives single-quote any 
>> kind of edge over double-quote (assuming they're both 
>> constant/non-interpolated strings) is the fact that double quoted 
>> strings are subject to more substitution rules (\r\n\t\xFF\012) and 
>> so have to spend an extra clock-cycle or two on scanning.
>>
>> Just like so many compile-time bottlenecks though, once you introduce 
>> an opcode cache, this distinction vanishes.
>> #4.1 Sara Golemon on 2006-06-19 11:02 (Reply)
>
>
>
> -- 
>
> Paul M. Jones  <http://paul-m-jones.com>
>
> Solar: Simple Object Library and Application Repository
> for PHP5.  <http://solarphp.com>
>
> Join the Solar community wiki!  <http://solarphp.org>
>
> Savant: The simple, elegant, and powerful solution for
> templates in PHP.  <http://phpsavant.com>
>
>
>
>
>
>
>
> -- 
>
> Paul M. Jones  <http://paul-m-jones.com>
>
> Solar: Simple Object Library and Application Repository
> for PHP5.  <http://solarphp.com>
>
> Join the Solar community wiki!  <http://solarphp.org>
>
> Savant: The simple, elegant, and powerful solution for
> templates in PHP.  <http://phpsavant.com>
>
>
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