Re: Static array causing problem in recursion

Hello ,

Richard Quadling thank you so much.. your trick worked... :) now its
working.. heres the modified code...

 public function getAllChildren($node,$level,$firstCall=false)

>
>   {
>       static $rootsarray=array();
>       static $levelcount;
>        if($firstCall) {
>           $rootsarray=array();
>        }
>       $levelcount=$level;
>       $child=self::getChild($node);
>       if($child==''||$levelcount==0)
>       {
>           return 1;
>       }
>       else
>       {
>           $levelcount--;
>           $rootsarray[]=$child;
>            self::getAllChildren($child,$levelcount,False);
>       }
>       return $rootsarray;
>
>   }
>
>
and i call the function like :

 $nodearray=tree::getAllChildren('W1',10,true);


Thank you so much for your support...

Midhun Girish


On Fri, Dec 4, 2009 at 3:18 PM, Richard Quadling
<[email protected]>wrote:

> 2009/12/4 Midhun Girish <[email protected]>
> >
> > Hello guys,
> > I was trying to use a recursive function to do a tree traversal.. i used
> a
> > static array to store the nodes at each recursion.. The function works
> > correctly if it is called only once during an execution.. but when i call
> it
> > twice or more, the nodes get appended to the array...hers the var dump of
> > the array...
> > Three:Array ( [0] => W4 )
> > Two:Array ( [0] => W4 [1] => W3 [2] => W4 )
> > One:Array ( [0] => W4 [1] => W3 [2] => W4 [3] => W2 [4] => W3 [5] => W4 )
> >
> > I tried to reset() the array and all but not working..i am not able to
> > chnage the index of the $rootsarray  back to 0... the new elelnts are
> added
> > at the end only...can anyone give me a push in the right direction?? Im
> > using PHP Version 5.2.9 in XAMPP... Hers the source...
> >
> >    public function getAllChildren($node,$level)
> >    {
> >        static $rootsarray=array();
> >        static $levelcount;
> >        $levelcount=$level;
> >        $child=self::getChild($node);
> >        if($child==''||$levelcount==0)
> >        {
> >            return 1;
> >        }
> >        else
> >        {
> >            $levelcount--;
> >            $rootsarray[]=$child;
> >            self::getAllChildren($child,$levelcount);
> >        }
> >        return $rootsarray;
> >
> >    }
> >
> > Midhun Girish
>
> Of course. The array is static. So the content is maintained between calls.
>
> You need to know when to initialize it.
>
> Something like ...
>
>  public function getAllChildren($node,$level,$firstCall=True)
>    {
>       static $rootsarray=array();
>       static $levelcount;
>        if($firstCall) {
>           $rootsarray=array();
>        }
>       $levelcount=$level;
>       $child=self::getChild($node);
>       if($child==''||$levelcount==0)
>       {
>           return 1;
>       }
>       else
>       {
>           $levelcount--;
>           $rootsarray[]=$child;
>            self::getAllChildren($child,$levelcount,False);
>       }
>       return $rootsarray;
>
>   }
>
>
> --
> -----
> Richard Quadling
> "Standing on the shoulders of some very clever giants!"
> EE : http://www.experts-exchange.com/M_248814.html
> Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731
> ZOPA : http://uk.zopa.com/member/RQuadling
>