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Re: [PHPiCalendar-DEV] help
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From: Waitman C. G. <wa...@em...> - 2002-10-18 14:03:57
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not much info on the php site with regards to this item, at least not
that I could find.
the pass by reference thing changed fairly recently, my guess is that
the documentation is not updated. most of the comments on the sscanf
page were posted before the change.
i looked through the php source, in ext/standard there are two files:
string.c
scanf.c
the sscanf function IS declared without the pass-by-reference, thus we
get the warning when trying to pass by reference.
it appears to me that the fellow working on implementation of the c
level extensions sscanf and fscanf in the php engine had trouble
registering the pass-by-reference arguments.
from what i have read in other ng postings: when zend changed the php
pass by reference thing, this caused problems with functions that accept
a variable number of arguments that are passed by reference (such as
sscanf). basically you have to either put the pointers in an array
before sending them to the function like this
$a = array(&$a, &$b, &$c);
my_function ($a) //sending three args as one, without pass-by-reference
which would likely make the sscanf function look weird compared to what
people are used to working with.
or you have to magically grab the variables from inside the function. it
looks like the php people decided on the second option. they are using
an internal function to grab the references to the variables and process
them correctly.
i do agree that it is an awkward situation, and i have seen other
complaints.
take care
waitman
On Fri, 2002-10-18 at 03:55, ja...@si... wrote:
OK, I understand it now. So if sscanf() isn't designed to take pass by
references, why do all the examples in the PHP manual use them? What good
does it do?
-Jared
> hello jared!
>
> passing by reference is sending a pointer to a variable to the function,
> instead of actually sending the variable to the function, which it uses
> to create a local variable within the function. when the function makes
> a change to it's variable, it updates the variable outside the function
> (The one you pointed to) since it's local copy is really "pointing" to
> your variable.
>
> function($arg) passing the value
> function(&$arg) passing the reference
>
> basically, if you have code like this:
>
> my_function(&$arg)
> {
> $arg=4; //no need to return
> }
>
> $a=7;
> my_function(&$a);
> echo $a;
>
> it would print "4"...
>
> NOW the error php now generates is "call time pass by reference is
> deprecated"
>
> which means you can't define a function like this:
>
> my_function($arg) {
> blah
> }
>
> and call it like this:
>
> my_function(&$a);
>
> in this case you would be stuffing the reference down the function's
> throat. the php guys really think that we should let php know that we
> actually want the reference sent to our function. In the case of the
> error message that was posted to this ng, the function declaration
> doesn't ask for references. the message points out that you can go in
> and modify the declaration if you want and rebuild php, or simply turn
> the warning off altogether. But if you do either you can't count on your
> program working in the future, or on someone else's machine.
>
> The php people are probably are looking to streamline the engine, and
> provide some good ole safe sanity enforcement to the reckless jungle one
> can create in php.
>
> But these are just my opinions.
>
> back in the old days you could practically walk into to town and get
> into a gun slinging fight in the middle of town, and hop back on your
> horse and head out without too much trouble. what i really mean is there
> was so much "slop" in php that most of the serious programmers wouldn't
> touch it with a ten foot pole.
>
> one day we will probably even have to define variable types in php
> beforehand.
>
> when i started using Personal Home Page ;-) i think it was actually
> refreshing programming in the slop. it even felt powerful. i mean, in
> real structured languages it sometimes feels like you spend more time
> typing all this extra crap in that is mostly meaningless - than doing
> real coding. but you learn that there are lots of really good reasons
> for the structure, and the type-checking and all that Alte Schule bars,
> bricks and stones stuff that php is slowing drifting toward.
>
> and i am pretty much still a young feller.
>
>
> Take care
>
> Waitman
>
>
>
>
> On Thu, 2002-10-17 at 17:25, Jared wrote:
> I don't understand exactly what "passing by reference" is and why I
> can't find any information about it being deprecated on the PHP
> website. I also want to know why all sscanf() function examples in
> the function list on the PHP website use references like we did and
> you say removing the & still allows the script to function
> normally. I don't understand the purpose of the & in the first
> place, then.
>
> I understand what & does, but I've never used it before and I'm not
> sure why it is or is not needed in that case.
>
> Anyway, Chad rewrote it so it doesn't even use sscanf so it no
> longer uses the & either.
>
> -Jared
>
> On Thursday, October 17, 2002, at 06:49 PM, Waitman C. Gobble
> wrote:
>
> > no, he is likely running a newer version of php.
> >
> > the fix is simple. pass by reference is deprecated, and support
> may cease in future builds of php. removing the & signs will
> remove the error (does not send references to the variables), and
> the script functions properly...
> >
> > take care
> >
> > waitman
> >
> >
> > On Thu, 2002-10-17 at 16:40, Chad wrote:
> > Your probably running an older version of PHP. You have four
> > options:
> >
> > 1) Update your PHP build
> > 2) Set allow_call_time_pass_reference to true in your INI
> file. 3) Download the latest version of PHP iCalendar from
> CVS. 4) Wait for 0.7, which should be out in a day or three.
> >
> >
> > On Thursday, October 17, 2002, at 09:50 PM, Steve Klenert
> wrote:
> >
> >> Just installed and i get this :
> >>
> >> Warning: Call-time pass-by-reference has been deprecated -
> argument passed
> >> by value; If you would like to pass it by reference, modify the
> declaration
> >> of sscanf(). If you would like to enable call-time
> pass-by-reference, you
> >> can set allow_call_time_pass_reference to true in your INI file.
> However,
> >> future versions may not support this any longer.
> >> in /home/sites/site3/web/calendars/functions/ical_parser.php on
> line 563
> >>
> >> Warning: Call-time pass-by-reference has been deprecated -
> argument passed
> >> by value; If you would like to pass it by reference, modify the
> declaration
> >> of sscanf(). If you would like to enable call-time
> pass-by-reference, you
> >> can set allow_call_time_pass_reference to true in your INI file.
> However,
> >> future versions may not support this any longer.
> >> in /home/sites/site3/web/calendars/functions/ical_parser.php on
> line 563
> >>
> >> Parse error: parse error, expecting `')''
> >> in
> /home/sites/site3/web/calendars/functions/overlapping_events.php
> on line
> >> 69
> >>
> >> Fatal error: Call to undefined function: checkoverlap()
> >> in /home/sites/site3/web/calendars/functions/ical_parser.php on
> line 548
> >>
> >> Please help ASAP>
> >>
> >> --
> >> Best Regards,
> >> Steve Klenert
> >> Digital Princeton
> >> "Quality in Service and Support is our #1 GOAL!"
> >> -=Hosting=--=Web Design=--=Dedicated Servers=--=Co-Location=-
> -=High Bandwidth Hosting Options=--=Load Balanced Servers=-
> www.digitalprinceton.net
> >> Emergency Contact: Pag...@Di...
> >>
> >>
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