Thanks Jason.
I was hoping that was what was happening.
Happy php'ing
--Noah
----- Original Message -----
From: "Jason Sheets" <[EMAIL PROTECTED]>
To: "Don Read" <[EMAIL PROTECTED]>
Cc: "CF High" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Saturday, March 15, 2003 8:46 PM
Subject: RE: [PHP] Performance and Function Calls
> Storing the results of a function in a variable and referencing the
> variable will almost always be faster, this should be no surprise
> because instead of executing the function PHP just has to return the
> variable's value.
>
> In #1 since you only call the function once the function is only
> executed once, in a loop it is executed once for each loop iteration.
>
> Jason
>
> On Sat, 2003-03-15 at 21:25, Don Read wrote:
> > On 15-Mar-2003 CF High wrote:
> > > Hey all.
> > >
> > > Quick question:
> > >
> > > If I have a function that, say, prints out the months in a year, and I
> > > call
> > > that function within a 10 cycle loop, which of the following is
faster:
> > >
> > > 1) Have function months() return months as a string; set var
> > > string_months = months() outside of the loop; then echo string_months
> > > within
> > > the loop
> > >
> > > -- OR
> > >
> > > 2) Just call months() for each iteration through the loop
> > >
> > > I'm not sure how PHP interprets option number 1.
> > >
> > > Guidance for the clueless much appreciated...........
> > >
> >
> > Easy enuff to test:
> >
> > <?php
> >
> > function getmicrotime(){
> > list($usec, $sec) = explode(" ",microtime());
> > return ((float)$usec + (float)$sec);
> > }
> >
> > $time_start = getmicrotime();
> > for ($m=1; $m <11; $m++) {
> > echo date('F', strtotime("2003-$m-1")), '<br>';
> > }
> > echo '<P>A: ', getmicrotime() - $time_start , '<P>';
> >
> > $time_start = getmicrotime();
> > for ($m=1; $m <11; $m++) {
> > $str[]=date('F', strtotime("2003-$m-1"));
> > }
> > echo implode('<br>',$str);
> > echo '<P>B: ', getmicrotime() - $time_start , '<P>';
> >
> > unset($str);
> > $time_start = getmicrotime();
> > for ($m=1; $m <11; $m++) {
> > $str[]=date('F', strtotime("2003-$m-1"));
> > }
> >
> > while (list(,$v)= each($str)) {
> > echo $v, '<br>';
> > }
> > echo '<P>C: ', getmicrotime() - $time_start , '<P>';
> >
> > ?>
> >
> > On my machine I get numbers like:
> > A: 0.000907063484192
> > B: 0.000651001930237
> > C: 0.000686049461365
> >
> > The function call within the loop is slower (contrary to what I
> > expected), the real question is how much effort do you want to expend to
> > save 2-3 micro-seconds?
> >
> > Regards,
> > --
> > Don Read [EMAIL PROTECTED]
> > -- It's always darkest before the dawn. So if you are going to
> > steal the neighbor's newspaper, that's the time to do it.
> --
> Jason Sheets <[EMAIL PROTECTED]>
>
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