Grabbing Arbitrary Amount of Function Arguments by Reference

[Curtis]

Hello everyone:

Recently, I've come across the need to accept an arbitrary amount of
arguments in my function, but I also need to alter the data in the
calling scope.

I have been trying to toy around with the func_get_args function,
however, it seems the data is copied before I can access it, as I
tried to globalize the values in the argument array and use
references, but neither worked.

I would be grateful if anyone could point me in the right direction or
provide any illumination on this subject.

Curtis

[Janwillem Borleffs]

Re: Grabbing Arbitrary Amount of Function Arguments by Reference

Curtis wrote:

I have been trying to toy around with the func_get_args function,
however, it seems the data is copied before I can access it, as I
tried to globalize the values in the argument array and use
references, but neither worked.
>

As a workaround, you can pass the function a single array or object by
reference:

function modify(&$object ) {
$object->a = strtoupper($obj ect->a);
}

$object = new stdClass;
$object->a = 'a';
modify($object) ;
print $object->a; // A

Note that when passing an object, it's passed by reference by default in PHP
5.


JW

[Curtis]

Re: Grabbing Arbitrary Amount of Function Arguments by Reference

Janwillem Borleffs wrote:

Curtis wrote:

>I have been trying to toy around with the func_get_args function,
>however, it seems the data is copied before I can access it, as I
>tried to globalize the values in the argument array and use
>references, but neither worked.
>>

>
As a workaround, you can pass the function a single array or object by
reference:
>
function modify(&$object ) {
$object->a = strtoupper($obj ect->a);
}
>
$object = new stdClass;
$object->a = 'a';
modify($object) ;
print $object->a; // A
>
Note that when passing an object, it's passed by reference by default in PHP
5.
>
>
JW
>
>

Ahh, thank you, I like your approach. Not sure why my mind was set on
varargs.

Thanks for the help,
Curtis, http://dyersweb.com

[Schraalhans Keukenmeester]

Re: Grabbing Arbitrary Amount of Function Arguments by Reference

Curtis wrote:

Hello everyone:
>
Recently, I've come across the need to accept an arbitrary amount of
arguments in my function, but I also need to alter the data in the
calling scope.
>
I have been trying to toy around with the func_get_args function,
however, it seems the data is copied before I can access it, as I tried
to globalize the values in the argument array and use references, but
neither worked.
>
I would be grateful if anyone could point me in the right direction or
provide any illumination on this subject.
>
Curtis

Not so elegant as the solution Janwillem provided, but a useable
workaround I once used:
<?PHP
function foo (&$v1,&$v2,&$v3 ,&$v4,&$v5,&$v6 ,&$v7,&$v8,&$v9 ,&$v10) {
$count = func_num_args() ;
for ($i=1;$i<=$coun t;$i++){
if (gettype(${"v$i "})=='integ er') {
${"v$i"}+=1;
}
}
return true;
}

$a=1;
$b=3;
$c=5;
$d=8;
$e='bar';
@foo ($a,$b,$c,$d,$e ); // suppress warnings about missing parameters
echo "$a $b $c $d $e";
// outputs 2 4 6 9 bar
?>

I haven't been able -like you- to alter parameter values when using the
non_parameteriz ed (is that English?) version of a function and
func_get_args() . Perhaps with some devious trickery it is possible to
find the referenced variables somewhere, somehow, but my guess is that
would not be a pure PHP solution.

Of ocurse the function is useless, but with some smart
type-checking-and-branching real nifty stuff could be constructed. I
haven't tested what the practial parameter list length limit is.

HTH

Sh