On 3/22/07, Jon Anderson <janderson@xxxxxxxxxxxxxxxxxx> wrote:
Your test isn't exactly fair. The for loop has no statements in it, and
the while loop has one. Your tests show while as approx 7% faster, while
a modified test shows an approximate 30% speed improvement:
Do this:
for ($i=0;$i<10000000;$i++) {}
v.s.:
$i = 0;
while ($i++ < 10000000) {}
The above while loop is 30% faster than the for. A little teaking on the
for loop, it's faster still:
I was comparing the way people normal use while and for. But this does
confirms what i said, while is faster.
for ($i=10000000;$i--;) {}
A little tweaking on the while, and it's faster yet:
$i = 10000000;
while ($i--) {}
The last while loop is around 60% faster on my hardware than the first
for loop.
jon
Tijnema ! wrote:
> On 3/22/07, Jake McHenry <linux@xxxxxxxxxxxxxxxxx> wrote:
>> does this help?
>>
>> http://www.php.lt/benchmark/phpbench.php
>>
>> Jake
>
> Well, there wasn't a test between For and While, so i did it myself,
> and i'm quite confused about the result.
> I let PHP count from 0 to 100000000 on my 1ghz AMD Athlon.
> While did it in a average time of 55 seconds.
> For did it in a average time of 59 seconds.
> It's not a big difference, if you see what number it needs to go to,
> but there is a difference.
>
> code used:
> <?php
> set_time_limit(100000);
> echo date("H:i:s");
> for($i = 0; $i < 100000000;$i++)
> {
> }
> echo date("H:i:s");
> $x = 0;
> while($x < 100000000)
> {
> $x++;
> }
> echo date("H:i:s");
> ?>
>
> So, use while loops instead of for loops ;)
>
> Tijnema
>
> ps. I also did the while loop before the for loop, doesn't matter.
>
>>
>>
>>
>> > -----Original Message-----
>> > From: Tijnema ! [mailto:tijnema@xxxxxxxxx]
>> > Sent: Thursday, March 22, 2007 4:38 PM
>> > To: PHP
>> > Subject: Performance: While or For loop
>> >
>> > Hi,
>> >
>> > Does somebody has benchmarks of what is faster, while or for loop?
>> >
>> > Thanks,
>> >
>> > Tijnema
>> >
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