simple tree class

[p3t3]

Hi, I have a simple tree class,

class mTree {

var $value = null;
var $children = array();

function mTree ($value) {

$this->value = $value;
}

function addChild ($value) {
$aux_node = & new mTree ($value);
$this->children [] =& $aux_node;
$this->displayTree("."
return $aux_node;
}
function getName (){
return $this->value;
}

function displayTree($indent){

echo($indent.$this->value.&quot;<br>&quot;
echo(&quot;children&quot;.count($this->children).&quot;<br>&quot;
forEach ($this->children as $child){
$child->displayTree($indent.&quot;.&quot;
}
}
}

------------------------------------------------

I add a couple of test nodes thus,

$dirRoot = new Mtree(&quot;PROJECTS&quot;
$newNode = $dirRoot->addChild(&quot;test1&quot;
$newNode->addChild(&quot;test1_1&quot;

my problem is, after adding &quot;test1_1&quot; the debuging code displays the tree from &quot;test1&quot; fine (i.e one child), but if I display the tree from $dirRoot, only &quot;test1&quot; seems to exist (i.e the child node vanishes). I assume I'm doing something stupid with references but Im lost...

Pete...

http://www.freesome.com

Digital Soma

 

[sleipnir214]

By default, PHP functions are pass-by-value. In order for your changes to the variable to be made permanent, you need to pass-by-reference.

I recommend you take a look at this page of the PHP online manual:

http://php.he.net/manual/en/functions.arguments.php

Want the best answers? Ask the best questions:

http://www.catb.org/~esr/faqs/smart-questions.html

TANSTAAFL!!