Re: Callback functions inside classes - how to?

[Chris Dowell <php@xxxxxxxxxxxxxx>]

From the manual:

http://uk.php.net/manual/en/language.pseudo-types.php#language.types.callback

If you want to change things in the callback, the function (or method) 
should accept its parameters by reference.

e.g.

class A
{
 function name(&$a, $b, $c)
 {
   $a = $b . $c;
   return;
 }

 function parse()
 {
   // whatever
   // then (calls $this->name())
   $parser->set_handler( "root/page/title", array($this, 'name') );
   // or (calls A::name())
   $parser->set_handler( "root/page/title", array('A', 'name') );
   // more whatever
 }

}

Hope this helps

Cheers

Chris

Thomas Hochstetter wrote:

> Hi again,
>
> I have always been wondering how this is done properly:
>
> Here is an example:
>
> [snip]
> class A {
>   function name( $a, $b, $c) {
>      $tmp = array();
>      $tmp[a] = $a;
>      .
>     array_push( $GLOBALS['XMLStack'], $tmp );
>  }
>
>  function parse() {
>    .. some definitions .
>    $parser->set_handler( "root/page/title", "name" );
>   . some more stuff here .
>  }
> }
> [/snip]
>
> What I want is to have the callback function name as it is in the above
> example. But, obviously, the above code won't work. So, how do I tell the
> set_handler function that it must use the name function from the class?
> Using:
> "A::name" or "$this->name" (if instantiated) . how do these callback
> function calls work, because the same issue is with the xml handler
> functions in php4 (have not as yet been to v5).
>
> Also, how can I get the data from the callback function out without using
> $GLOBALS? I cannot just return an array, can I?
>
> Any ideas.
>
> Thanks so  long.
>
> Thomas

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