Well, I think this has something to do with bug #6352 I have posted today. A very strange behaviour.

Here is the source:

<?php

  class CBase {
    var $aChildren=array();

    function CBase($hParent=0) {
      if ($hParent!=0) $hParent->addChildren(&$this);
    }

    function addChildren($Children) {
      $this->aChildren[]=&$Children;
    }

    function draw() {
      $this->drawChildren();
    }
 
    function drawChildren() {
      for ($iCount=0;$iCount<count($this->aChildren);$iCount++)
        $this->aChildren[$iCount]->draw();
    }

    function printMe($sValue) {
      printf($sValue);
    }
  }

  class CBaseExt extends CBase {
    var $sBugMaker;
    
    function draw() {
      $this->printMe($this->sBugMaker);
      $this->drawChildren();
    }
  }

  class CChild extends CBase {
    function draw() {
      printf("It's working!<br>\n");
    }
  }

  class CParent extends CBaseExt {
    function CParent($Parent=0) {
    
      // Comment me out, and I will work...
      $this->sBugMaker="I'm the trouble maker";

      $this->Table=new CChild(&$this);
    }
  }

  $Page=new CParent();
  $Page->draw();
?>

This script creates the class Parent. The constructor of the Parent creates
a child. If I draw the Parent, the Child is drawn, too.

This code produces the follwoing error:

Fatal error: Call to a member function on a non-object in /var/www/ailis.de/bugs/bug.php on line 20

Looks like I have an error in my script, but... If I comment out the line where I write something in the Property $sTroubleMaker, the script is working.
I can't imagine that this is an error in my script. This line seems to be
messing around ALOT, if I extend the script to do a lot of normal tasks
with classes, it produces Segfaults. And again, if I remove the line, all
is working perfectly.

You can test this behaviour. I have published this script with and without error here:

http://www.ailis.de/bugs/bug.php
http://www.ailis.de/bugs/nobug.php

bug.txt und nobug.txt are symbolic links to these files, so you can read
the source code.

I have reproduced this bug on three different machines. All are running
apache 1.3.9 and php 4.01pl2 under linux.

Maybe you can reproduce another strange behaviour: Load the nobug.php-Link from above in to a browser. The script is working. Now hit reload and it maybe that you get the same error message if loading bug.php. I can reproduce this with Netscape, but not with Konqueror. Really strange.

Bye
K