Array

Re: Array


"BKDotCom" <BradKent@swbel l.net> wrote in message
news:e8269f23.0 309220613.36be2 a1e@posting.goo gle.com...[color=blue]
> *cough cough*
> Your test 2 took 66 seconds.
> you didn't reinitialize $start after test1 compleated... therefore
> 152 seconds is the total time your script ran.
>
> so:
> 86 sec for test 1 (quotes)
> 66 sec for test 2 (no quotes)
> 152 sec: total
>
> but, bonus points to you for actually taking the time to research this.
>
>
> "Randell D." <you.can.email. me.at.randelld@ yahoo.com> wrote in message[/color]
news:<Eevbb.204 019$la.4059525@ news1.calgary.s haw.ca>...[color=blue][color=green]
> > "BKDotCom" <BradKent@swbel l.net> wrote in message
> > news:e8269f23.0 309211242.6eabf 88d@posting.goo gle.com...[color=darkred]
> > > Jan Pieter Kunst <devnull@cauce. org> wrote in message >
> > > > use double quotes, otherwise variables will not be interpolated:
> > > >
> > > > echo $maanden["$md"];
> > >
> > > sorry, you've just hit my pet-peeve. Surrounding a variable in
> > > double-quotes is a waste, PHP doesn't know what's in the quotes and
> > > must go in a parse the string to find any variables to expand,
> > > escaped, chars, or whatever. Variables don't need to be quoted.. just
> > > use $maanden[$md]. Can someone back-up my belief that they
> > > "shouldn't" be quoted?[/color]
> >
> > I *would* have agreed until I tested both... and you'll be surprised of[/color][/color]
the[color=blue][color=green]
> > results...
> >
> > The performance difference would be small on a quiet server with a small
> > workload - However, given a busier environment, the performance[/color][/color]
enhancement[color=blue][color=green]
> > differs almost 50%.
> >
> > In my test, I had a loop which checked the value of an array element -[/color][/color]
The[color=blue][color=green]
> > element was also a variable - First test had the element variable inside
> > quotes (thus $testArray["$element"]) while the second test excluded the
> > double quotes (thus $testArray[$element]).
> >
> > I ran this on my server whereby I was the only user - the box was almost
> > asleep so I cannot blame it on other environment changes - I also ran[/color][/color]
the[color=blue][color=green]
> > test twice. Test 1 took 86seconds while test 2 took 152 seconds...
> >
> > Surprised? So was I... It looks like its better to include double[/color][/color]
quotes as[color=blue][color=green]
> > opposed to excluding them - I've not worked out why just yet... I'll[/color][/color]
pitch a[color=blue][color=green]
> > seperate post asking folk to comment on this... My test script follows
> > below:
> >
> > <?
> > // Perform a test $maxLoop number of times, count the number of seconds
> > // it takes to complete the loop - Test 1 has the array element named
> > // inside double quotes, Test 2 excludes the double quotes
> > set_time_limit( 250);
> > $testArray=$_EN V;
> > $maxLoop=100000 ;
> > /////////////////////// Test 1 ////////////////////
> > $start=time();
> > for($loopMany=0 ; $loopMany<$maxL oop; ++$loopMany)
> > { foreach($testAr ray as $elementName=>$ elementValue)
> > { if($testArray["$elementNa me"]=="HOST")
> > { $thisHost="$ele mentValue"; }
> > }
> > }
> > $end=time();
> > $difference=$en d-$start;
> > print("<br>Dura tion 1: $difference<hr> ");
> >
> > set_time_limit( 250);
> > $testArray=$_EN V;
> > $maxLoop=100000 ;
> > /////////////////////// Test 2 ////////////////////
> > for($loopMany=0 ; $loopMany<$maxL oop; ++$loopMany)
> > { foreach($testAr ray as $elementName=>$ elementValue)
> > { if($testArray[$elementName]=="HOST")
> > { $thisHost="$ele mentValue"; }
> > }
> > }
> > $end=time();
> > $difference=$en d-$start;
> > print("<br>Dura tion 2: $difference<hr> ");
> > ?>[/color][/color]


That is a bit embarrassing isn't it.... thanks for pointing that one out -
It could have steered me (and others) in the wrong direction...

Re: Array

*cough cough*
Your test 2 took 66 seconds.
you didn't reinitialize $start after test1 compleated... therefore
152 seconds is the total time your script ran.

so:
86 sec for test 1 (quotes)
66 sec for test 2 (no quotes)
152 sec: total

but, bonus points to you for actually taking the time to research this.


"Randell D." <you.can.email. me.at.randelld@ yahoo.com> wrote in message news:<Eevbb.204 019$la.4059525@ news1.calgary.s haw.ca>...[color=blue]
> "BKDotCom" <BradKent@swbel l.net> wrote in message
> news:e8269f23.0 309211242.6eabf 88d@posting.goo gle.com...[color=green]
> > Jan Pieter Kunst <devnull@cauce. org> wrote in message >[color=darkred]
> > > use double quotes, otherwise variables will not be interpolated:
> > >
> > > echo $maanden["$md"];[/color]
> >
> > sorry, you've just hit my pet-peeve. Surrounding a variable in
> > double-quotes is a waste, PHP doesn't know what's in the quotes and
> > must go in a parse the string to find any variables to expand,
> > escaped, chars, or whatever. Variables don't need to be quoted.. just
> > use $maanden[$md]. Can someone back-up my belief that they
> > "shouldn't" be quoted?[/color]
>
> I *would* have agreed until I tested both... and you'll be surprised of the
> results...
>
> The performance difference would be small on a quiet server with a small
> workload - However, given a busier environment, the performance enhancement
> differs almost 50%.
>
> In my test, I had a loop which checked the value of an array element - The
> element was also a variable - First test had the element variable inside
> quotes (thus $testArray["$element"]) while the second test excluded the
> double quotes (thus $testArray[$element]).
>
> I ran this on my server whereby I was the only user - the box was almost
> asleep so I cannot blame it on other environment changes - I also ran the
> test twice. Test 1 took 86seconds while test 2 took 152 seconds...
>
> Surprised? So was I... It looks like its better to include double quotes as
> opposed to excluding them - I've not worked out why just yet... I'll pitch a
> seperate post asking folk to comment on this... My test script follows
> below:
>
> <?
> // Perform a test $maxLoop number of times, count the number of seconds
> // it takes to complete the loop - Test 1 has the array element named
> // inside double quotes, Test 2 excludes the double quotes
> set_time_limit( 250);
> $testArray=$_EN V;
> $maxLoop=100000 ;
> /////////////////////// Test 1 ////////////////////
> $start=time();
> for($loopMany=0 ; $loopMany<$maxL oop; ++$loopMany)
> { foreach($testAr ray as $elementName=>$ elementValue)
> { if($testArray["$elementNa me"]=="HOST")
> { $thisHost="$ele mentValue"; }
> }
> }
> $end=time();
> $difference=$en d-$start;
> print("<br>Dura tion 1: $difference<hr> ");
>
> set_time_limit( 250);
> $testArray=$_EN V;
> $maxLoop=100000 ;
> /////////////////////// Test 2 ////////////////////
> for($loopMany=0 ; $loopMany<$maxL oop; ++$loopMany)
> { foreach($testAr ray as $elementName=>$ elementValue)
> { if($testArray[$elementName]=="HOST")
> { $thisHost="$ele mentValue"; }
> }
> }
> $end=time();
> $difference=$en d-$start;
> print("<br>Dura tion 2: $difference<hr> ");
> ?>[/color]

Re: Array


"BKDotCom" <BradKent@swbel l.net> wrote in message
news:e8269f23.0 309211242.6eabf 88d@posting.goo gle.com...[color=blue]
> Jan Pieter Kunst <devnull@cauce. org> wrote in message >[color=green]
> > use double quotes, otherwise variables will not be interpolated:
> >
> > echo $maanden["$md"];[/color]
>
> sorry, you've just hit my pet-peeve. Surrounding a variable in
> double-quotes is a waste, PHP doesn't know what's in the quotes and
> must go in a parse the string to find any variables to expand,
> escaped, chars, or whatever. Variables don't need to be quoted.. just
> use $maanden[$md]. Can someone back-up my belief that they
> "shouldn't" be quoted?[/color]

I *would* have agreed until I tested both... and you'll be surprised of the
results...

The performance difference would be small on a quiet server with a small
workload - However, given a busier environment, the performance enhancement
differs almost 50%.

In my test, I had a loop which checked the value of an array element - The
element was also a variable - First test had the element variable inside
quotes (thus $testArray["$element"]) while the second test excluded the
double quotes (thus $testArray[$element]).

I ran this on my server whereby I was the only user - the box was almost
asleep so I cannot blame it on other environment changes - I also ran the
test twice. Test 1 took 86seconds while test 2 took 152 seconds...

Surprised? So was I... It looks like its better to include double quotes as
opposed to excluding them - I've not worked out why just yet... I'll pitch a
seperate post asking folk to comment on this... My test script follows
below:

<?
// Perform a test $maxLoop number of times, count the number of seconds
// it takes to complete the loop - Test 1 has the array element named
// inside double quotes, Test 2 excludes the double quotes
set_time_limit( 250);
$testArray=$_EN V;
$maxLoop=100000 ;
/////////////////////// Test 1 ////////////////////
$start=time();
for($loopMany=0 ; $loopMany<$maxL oop; ++$loopMany)
{ foreach($testAr ray as $elementName=>$ elementValue)
{ if($testArray["$elementNa me"]=="HOST")
{ $thisHost="$ele mentValue"; }
}
}
$end=time();
$difference=$en d-$start;
print("<br>Dura tion 1: $difference<hr> ");

set_time_limit( 250);
$testArray=$_EN V;
$maxLoop=100000 ;
/////////////////////// Test 2 ////////////////////
for($loopMany=0 ; $loopMany<$maxL oop; ++$loopMany)
{ foreach($testAr ray as $elementName=>$ elementValue)
{ if($testArray[$elementName]=="HOST")
{ $thisHost="$ele mentValue"; }
}
}
$end=time();
$difference=$en d-$start;
print("<br>Dura tion 2: $difference<hr> ");
?>

Re: Array

In article <e8269f23.03092 11242.6eabf88d@ posting.google. com>,
BradKent@swbell .net (BKDotCom) wrote:
[color=blue][color=green]
> > use double quotes, otherwise variables will not be interpolated:
> >
> > echo $maanden["$md"];[/color]
>
> sorry, you've just hit my pet-peeve. Surrounding a variable in
> double-quotes is a waste, PHP doesn't know what's in the quotes and
> must go in a parse the string to find any variables to expand,
> escaped, chars, or whatever. Variables don't need to be quoted.. just
> use $maanden[$md]. Can someone back-up my belief that they
> "shouldn't" be quoted?[/color]

You are right. I probably had the rule 'You should always use quotes
around a string literal array index'
(see <http://nl2.php.net/types.array>) in mind, but that is about string
literals, not about variables. There is no need to use double quotes
around variable array keys. (I doubt that there will be a noticeable
speed difference, though.)

JP

--
Sorry, <devnull@cauce. org> is een "spam trap".
E-mail adres is <jpk"at"akamail .com>, waarbij "at" = @.

Re: Array

BradKent@swbell .net (BKDotCom) schrieb:
[color=blue]
> Jan Pieter Kunst <devnull@cauce. org> wrote in message >[color=green]
>> use double quotes, otherwise variables will not be interpolated:
>>
>> echo $maanden["$md"];[/color]
>
> sorry, you've just hit my pet-peeve. Surrounding a variable in
> double-quotes is a waste, PHP doesn't know what's in the quotes and
> must go in a parse the string to find any variables to expand,
> escaped, chars, or whatever. Variables don't need to be quoted.. just
> use $maanden[$md]. Can someone back-up my belief that they
> "shouldn't" be quoted?[/color]

It takes just some few extra microseconds of time if you use double
quotes, but that adds up with each time you run those scripts.

I prefer to use no quotes if there would be just one variable inside the
string and I use single quotes if the string contains no variable that
has to be interpolated.

Regards,
Matthias

Re: Array

Jan Pieter Kunst <devnull@cauce. org> wrote in message >[color=blue]
> use double quotes, otherwise variables will not be interpolated:
>
> echo $maanden["$md"];[/color]

sorry, you've just hit my pet-peeve. Surrounding a variable in
double-quotes is a waste, PHP doesn't know what's in the quotes and
must go in a parse the string to find any variables to expand,
escaped, chars, or whatever. Variables don't need to be quoted.. just
use $maanden[$md]. Can someone back-up my belief that they
"shouldn't" be quoted?

Re: Array

> > $maanden = array([color=blue][color=green]
> > 01 => "Januari",
> > 02 => "Februari",
> > 03 => "Maart",
> > 04 => "April",
> > 05 => "Mei",
> > 06 => "Juni",
> > 07 => "Juli",
> > 08 => "Augustus",
> > 09 => "September" ,
> > 10 => "Oktober",
> > 11 => "November",
> > 12 => "December"
> > );[/color][/color]

you could of course use strftime("%B") (http://at2.php.net/strftime) and
setlocale() (http://at2.php.net/manual/en/function.setlocale.php) to have
the month names in your language.....

Re: Array

"FiremanSAM " <firemansam@co. uk> schreef in bericht
news:tZfbb.5640 $P51.8734@amstw ist00...[color=blue]
> I have made a script that redirect a user to the page related to the[/color]
month.[color=blue]
> I bind the month numbers to the url as uitrukken.php?m d=05
>
> Now....i would print the month name on my page. I have made the following
> array.
>
> <?PHP
> $maanden = array(
> 01 => "Januari",
> 02 => "Februari",
> 03 => "Maart",
> 04 => "April",
> 05 => "Mei",
> 06 => "Juni",
> 07 => "Juli",
> 08 => "Augustus",
> 09 => "September" ,
> 10 => "Oktober",
> 11 => "November",
> 12 => "December"
> );
>
> echo $maanden['$md'];
> ?>
>
> Why doen't show dis the month. In which format can i use a array with a
> variabele as echo $maanden['$md'];[/color]

Drop the single quotes:

echo $maanden[$md];

Re: Array

In article <tZfbb.5640$P51 .8734@amstwist0 0>,
"FiremanSAM " <firemansam@co. uk> wrote:
[color=blue]
> Why doen't show dis the month. In which format can i use a array with a
> variabele as echo $maanden['$md'];[/color]

use double quotes, otherwise variables will not be interpolated:

echo $maanden["$md"];

If register_global s is off in your setup, you'll need to do this:

echo $maanden[$_GET['md']];

JP

--
Sorry, <devnull@cauce. org> is een "spam trap".
E-mail adres is <jpk"at"akamail .com>, waarbij "at" = @.

I have made a script that redirect a user to the page related to the month.
I bind the month numbers to the url as uitrukken.php?m d=05

Now....i would print the month name on my page. I have made the following
array.

<?PHP
$maanden = array(
01 => "Januari",
02 => "Februari",
03 => "Maart",
04 => "April",
05 => "Mei",
06 => "Juni",
07 => "Juli",
08 => "Augustus",
09 => "September" ,
10 => "Oktober",
11 => "November",
12 => "December"
);

echo $maanden['$md'];
?>

Why doen't show dis the month. In which format can i use a array with a
variabele as echo $maanden['$md'];

FiremanSAM