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Posted by Nicholas Sherlock on 02/03/06 01:51
Nicholas Sherlock wrote:
> This malfunctions in a weird way in PHP 4 (I get a truncated tree). In
> desperation, I downloaded the trial of PHPEdit to use the debugger, and
> the program worked flawlessly! I suspect that the difference is that
> PHPEdit uses PHP 5 while my testing server and my production server are
> using PHP 4 (Both were operating on the exact same data).
I finally tracked it down to the stupid way that PHP 4 makes a copy of
an object unless you explicitly pass it by reference with the '&'
character. I thought that I had it covered, I sprinkled & everywhere it
would go when I worked with my tree. I eventually tracked the problem
down to the code I used for adding a child to the list of child nodes:
function builddown(&$childnode)
{
array_push($this->children,$childnode);
}
This results in a copy of $childnode being pushed on to the array, not a
reference to $childnode. Array_push doesn't take a reference for the
object being pushed. Solution:
array_push($this->children,null);
$this->children[count($this->children)-1]=&$childnode;
(There is probably a neater way of doing that)
If you want OOP, don't use PHP 4. I wish I had the choice.
Cheers,
Nicholas Sherlock
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