Passing Variable Length Argument List to Parent

**Dani CS** · Jul 17 '05, 09:54 AM

Re: Passing Variable Length Argument List to Parent

Mark wrote:[color=blue]
> hello!
>
> I have a class method that takes a variable number of parameters and
> correctly deals with them with func_get_args, etc ...
>
> i.e.
>
> class ABC
> {
> public function MooSaysTheCow()
> {
> foreach (func_get_args( ) as $arg_name => $arg_value)
> {
> ...
> }
> }
> }
>
> now, the problem is: i want to override this class and this method, have
> that overriding method call the base class and then do something else. The
> problem is that I don't know how to pass the parameters along.[/color]

Check the comments for
<http://www.php.net/manual/en/function.func-get-args.php>
[color=blue]
>
> class DEF
> {
> public function MooSaysTheCow()
> {
> parent::MooSays TheCow( WHAT DO I PUT HERE ????? );
> echo "Overridden version with new exciting features!";
> }
> }
>
>
> Any ideas?
>
> the best i've thought of so far is terribly yucky, and not flexible to
> arbitrary numbers of parameters .... blech.
>
> class DEF
> {
> public function MooSaysTheCow()
> {
> switch (func_get_num_a rgs())
> {
> case 1:
> parent::MooSays TheCow(func_get _arg(0));
> break;
> case 2:
> parent::MooSays TheCow(func_get _arg(0), func_get_arg(1) );
> break;
> etc ....
> ...
> ..
> .
> }
> }
> }
>
>
> thanks.
> mark.
>
>[/color]

**konsu** · Jul 17 '05, 09:54 AM

Re: Passing Variable Length Argument List to Parent

did you try to pass the return value of func_get_args() ?

"Mark" <mw@ANGRYLanfea r.com> wrote in message
news:IsednfQ8IZ ZKrSvcRVn-rQ@nventure.com ...[color=blue]
>
> hello!
>
> I have a class method that takes a variable number of parameters and
> correctly deals with them with func_get_args, etc ...
>
> i.e.
>
> class ABC
> {
> public function MooSaysTheCow()
> {
> foreach (func_get_args( ) as $arg_name => $arg_value)
> {
> ...
> }
> }
> }
>
> now, the problem is: i want to override this class and this method, have
> that overriding method call the base class and then do something else.
> The
> problem is that I don't know how to pass the parameters along.
>
> class DEF
> {
> public function MooSaysTheCow()
> {
> parent::MooSays TheCow( WHAT DO I PUT HERE ????? );
> echo "Overridden version with new exciting features!";
> }
> }
>
>
> Any ideas?
>
> the best i've thought of so far is terribly yucky, and not flexible to
> arbitrary numbers of parameters .... blech.
>
> class DEF
> {
> public function MooSaysTheCow()
> {
> switch (func_get_num_a rgs())
> {
> case 1:
> parent::MooSays TheCow(func_get _arg(0));
> break;
> case 2:
> parent::MooSays TheCow(func_get _arg(0), func_get_arg(1) );
> break;
> etc ....
> ...
> ..
> .
> }
> }
> }
>
>
> thanks.
> mark.
>
>
> --
> I am not an ANGRY man. Remove the rage from my email to reply.
>
> Ashlee Simpson Sings! You Faint .... --More--
> Ashlee Simpson Sings! Ashlee Simpsons sings! You die ... --More--[/color]

**Andy Hassall** · Jul 17 '05, 09:54 AM

Re: Passing Variable Length Argument List to Parent

On Tue, 07 Dec 2004 15:37:52 -0800, Mark <mw@ANGRYLanfea r.com> wrote:
[color=blue]
> I have a class method that takes a variable number of parameters and
>correctly deals with them with func_get_args, etc ...
>
> i.e.
>
> class ABC
> {
> public function MooSaysTheCow()
> {
> foreach (func_get_args( ) as $arg_name => $arg_value)
> {
> ...
> }
> }
> }
>
> now, the problem is: i want to override this class and this method, have
>that overriding method call the base class and then do something else. The
>problem is that I don't know how to pass the parameters along.
>
> class DEF
> {
> public function MooSaysTheCow()
> {
> parent::MooSays TheCow( WHAT DO I PUT HERE ????? );
> echo "Overridden version with new exciting features!";
> }
> }
>
>
> Any ideas?
>
> the best i've thought of so far is terribly yucky, and not flexible to
>arbitrary numbers of parameters .... blech.
>
> class DEF
> {
> public function MooSaysTheCow()
> {
> switch (func_get_num_a rgs())
> {
> case 1:
> parent::MooSays TheCow(func_get _arg(0));
> break;
> case 2:
> parent::MooSays TheCow(func_get _arg(0), func_get_arg(1) );
> break;
> etc ....
> ...
> ..
> .
> }
> }
> }[/color]

What am I missing here; can't you just use func_get_args() to pass the
arguments upwards?

--
Andy Hassall / <andy@andyh.co. uk> / <http://www.andyh.co.uk >
<http://www.andyhsoftwa re.co.uk/space> Space: disk usage analysis tool

**Mark** · Jul 17 '05, 09:54 AM

Re: Passing Variable Length Argument List to Parent

Dani CS wrote:
[color=blue]
>
> Check the comments for
> <http://www.php.net/manual/en/function.func-get-args.php>[/color]

Close!

func_get_args() doesn't work because the parent function has to then be
expecting an array parameter, not a list of parameters as normal (and i do
NOT have control over the parent implementation -- it's a prepackaged
class).

i was moderately hopeful when I saw the function call_user_func_ array,
which does what i want -- takes an array with parameters and calls the
function with the array values as normal arguments

EXCEPT -- that won't work within classes, expeshully in the __construct
method ...

argh.

any other ideas?

thanks!
mark.

**Joshua Beall** · Jul 17 '05, 09:54 AM

Re: Passing Variable Length Argument List to Parent

I'm typing this without testing it, but it seems like it would work. I'm
sure you take a performance hit from the eval() call, though.

$argList = '';
for($n=0;$n<fun c_get_num_args( );$n++)
$argList .= "func_get_arg($ n),";
$argList = rtrim($argList, ',');
/* $argList will not be a string that looks like
"func_get_art(0 ),func_get_arg( 1),func_get_arg (2)", repeating for however
many arguments have been passed*/
eval("parent::M ooSaysTheCow($a rgList);");

Worth a shot.

**Michael Fesser** · Jul 17 '05, 09:54 AM

Re: Passing Variable Length Argument List to Parent

.oO(Mark)
[color=blue]
> I have a class method that takes a variable number of parameters and
>correctly deals with them with func_get_args, etc ... [...]
>
> now, the problem is: i want to override this class and this method, have
>that overriding method call the base class and then do something else. The
>problem is that I don't know how to pass the parameters along.
>
> class DEF
> {
> public function MooSaysTheCow()
> {
> parent::MooSays TheCow( WHAT DO I PUT HERE ????? );
> echo "Overridden version with new exciting features!";
> }
> }[/color]

Try

public function MooSaysTheCow() {
$args = func_get_args() ;
call_user_func_ array(array('pa rent', 'MooSaysTheCow' ), $args);
}

Micha

**Joshua Beall** · Jul 17 '05, 09:54 AM

Re: Passing Variable Length Argument List to Parent

"Michael Fesser" <netizen@gmx.ne t> wrote in message
news:hf5er09fhd skuf07ap47s3frc chs7cg8ad@4ax.c om...[color=blue]
> Try
>
> public function MooSaysTheCow() {
> $args = func_get_args() ;
> call_user_func_ array(array('pa rent', 'MooSaysTheCow' ), $args);
> }[/color]

Very clever. Mark, please report back and let us know if this works for
you!

**Mark** · Jul 17 '05, 10:04 AM

Re: Passing Variable Length Argument List to Parent

Joshua Beall wrote:
[color=blue]
> "Michael Fesser" <netizen@gmx.ne t> wrote in message
> news:hf5er09fhd skuf07ap47s3frc chs7cg8ad@4ax.c om...[color=green]
>> Try
>>
>> public function MooSaysTheCow() {
>> $args = func_get_args() ;
>> call_user_func_ array(array('pa rent', 'MooSaysTheCow' ), $args);
>> }[/color]
>
> Very clever. Mark, please report back and let us know if this works for
> you![/color]

nope. probably would have in PHP4, but most certainly not in PHP5.

i'm still stuck with the switch statement in PHP5, unfortunately.

argh!
mark.

--
I am not an ANGRY man. Remove the rage from my email to reply.

**Mark** · Jul 17 '05, 10:04 AM

Re: Passing Variable Length Argument List to Parent

Andy Hassall wrote:
[color=blue]
> On Tue, 07 Dec 2004 15:37:52 -0800, Mark <mw@ANGRYLanfea r.com> wrote:
>[/color]
[color=blue]
>
> What am I missing here; can't you just use func_get_args() to pass the
> arguments upwards?[/color]

no. at least not in overloaded methods in classes.

the problem is that the overloadER and the overloadEE are both looking for
variable argument lists. func_get_args() returns an ARRAY.

now, the obvious (lame) solution would be to modify both functions to just
take arrays of arguments but ... i don't have control over the base class's
implementation (it's the mysqli class).

so, i appear to be stuck with the switch statement way of doing things.
d'oh!

thanks,
mark.

--
I am not an ANGRY man. Remove the rage from my email to reply.

**Michael Fesser** · Jul 17 '05, 10:05 AM

Re: Passing Variable Length Argument List to Parent

.oO(Mark)
[color=blue]
> nope. probably would have in PHP4, but most certainly not in PHP5.[/color]

Hmm. The following works here on PHP5 when called statically:

class TBar {
function doSomething() {
print_r(func_ge t_args());
}
}

class TFoo extends TBar {
function doSomething() {
$args = func_get_args() ;
call_user_func_ array(array('pa rent', 'doSomething'), $args);
}
}

TFoo::doSomethi ng(23, 42);

If called on an instance of TFoo my PHP crashes. But if I declare the
above methods 'static' then it works, even if invoked non-statically ...
[color=blue]
> i'm still stuck with the switch statement in PHP5, unfortunately.[/color]

You could also try it with eval(), as already mentioned in another post.

Micha

**Mark** · Jul 17 '05, 10:28 AM

Re: Passing Variable Length Argument List to Parent

Michael Fesser wrote:

[color=blue]
> Hmm. The following works here on PHP5 when called statically:
>
> class TBar {
> function doSomething() {
> print_r(func_ge t_args());
> }
> }
>
> class TFoo extends TBar {
> function doSomething() {
> $args = func_get_args() ;
> call_user_func_ array(array('pa rent', 'doSomething'), $args);
> }
> }
>
> TFoo::doSomethi ng(23, 42);[/color]

aaaah. the problem is that i am trying to do this in the constructor. of
the mysqli class.

argh.

such is life :-).

[color=blue]
> You could also try it with eval(), as already mentioned in another post.[/color]

!aaaieee!

might be the only solution.

thanks much!
[color=blue]
> Micha[/color]

--
I am not an ANGRY man. Remove the rage from my email to reply.

Passing Variable Length Argument List to Parent

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