On Wed, 2008-06-04 at 13:12 -0400, Robert Cummings wrote:
> On Wed, 2008-06-04 at 10:56 -0600, Nathan Nobbe wrote:
> > On Wed, Jun 4, 2008 at 10:26 AM, Robert Cummings <robert@xxxxxxxxxxxxx>
> > wrote:
> >
> > > Nope, case insensitive is slower since you must make two tests for
> > > characters having a lower and upper case version. With case sensitive
> > > comparisons you only need to make a single comparison.
> >
> >
> > a quick test shows stripos beating strpos.
> >
> > <?php
> >
> > $str = 'asSAFAASFDADSfasfjhalskfjhlaseAERQWERQWER;.dafasjhflasfjd';
> > $search = 'fdasASDFAafdas';
> >
> > $start = microtime();
> > strpos($str, $search);
> > $end = microtime();
> > $r1 = $end - $start;
> >
> > $start = microtime();
> > stripos($str, $search);
> > $end2 = microtime();
> > $r2 = $end2 - $start;
> >
> > echo "strpos: $r1\n";
> > echo "stripos: $r2\n";
> >
> > if($r2 < $r1) {
> > echo 'stripos is faster' . PHP_EOL;
> > }
> > ?>
>
> Did you just try to use a test that used a single iteration to prove me
> wrong? OMFG ponies!!! Loop each one of those 10 million times, use a
> separate script for each, and use the system time program to
> appropriately measure the time the system takes.
Here's my results on my Athlon 2400, 10 million loops on each type using
your script settings for $str and $search and making 3 runs each time:
strpos()
===========================================
real 0m7.133s
user 0m6.480s
sys 0m0.020s
real 0m6.134s
user 0m6.068s
sys 0m0.016s
real 0m6.527s
user 0m6.476s
sys 0m0.012s
stripos()
===========================================
real 0m13.720s
user 0m13.517s
sys 0m0.072s
real 0m13.158s
user 0m13.009s
sys 0m0.016s
real 0m13.151s
user 0m13.013s
sys 0m0.012s
Now, that's how you test efficiency. Doing a single run is very, very
subject to whatever else your processor might be doing and as such is
usually garbage for any kind of analysis.
Cheers,
Rob.
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