Posted by Jochem Maas on 10/02/72 11:05

Tom wrote:
> Hi
>
> I'm batting my head against a wall on this one...
> I have a class that has a constructor which sets some initial
> conditions, and then a public function that does some work. I want to be
> able to call this function from an external array_walk call, but when I
> try and reference it as $myClass->myFunction in the array_walk call, I
> get an error back saying that this is an invalid function.
>
> eg)
> <?php
> include "../includes/aClass.class";
>
> $myArray = array("item1"=>"firstItem", "item2"=>"secondItem");
> $myClass = new aClass;
>
> array_walk($myArray,'$myClass->aMemberFunction');

try changing this line to:

array_walk($myArray, array($myClass,'aMemberFunction'));

or if you prefer to take the route of your second attempt read on...

> ?>
>
> As a workaround, I redifined the class so that there was a public
> function which made the array_walk call with the worker function defined
> internally as follows, but this throws another issue in that if I create
> multiple instances of the class then I get an error to say that the
> internal function is already defined ...

which is correct, you are trying to create this function multiple times.

>
>> *Fatal error*: Cannot redeclare aFunction() (previously declared in
>> /usr/local/apache2/htdocs/includes/functions.php:23) in
>> */usr/local/apache2/htdocs/includes/functions.php* on line *23*
>
>
> class aClass
> {
> some other stuff, constructor etc
> public function aPublicFunction($anArray)
> {
> global $aRetrunString;
> function aFunction($value, $key)
> {
> global $aReturnString;
> $aReturnString = $aReturnString.$value; }
>
> array_walk($anArray,'aFunction');
> return $aReturnString;
> }

wrap the function def. like so:

if (!function_exists('aFunction')) {
function aFunction($value, $key)
{
global $aReturnString;
$aReturnString = $aReturnString.$value;
}
}

OR define the function outside of the class e.g.

function aFunction($value, $key)
{
global $aReturnString;
$aReturnString = $aReturnString.$value;
}

BTW: using a global in the way you do in this function is a bad idea.
array_walk() is defined as follows:

bool array_walk ( array &array, callback funcname [, mixed userdata])

check out the manual for info on the last arg:
http://nl2.php.net/array_walk

> }
>
> Can anyone help me to get either solution to a working state?
>
> By the way...
> apache 2.0.49
> php-5.0.2
>
> Thanks very much
>
> Tom
>

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