array_walk in class

[Hawk2005]

Hi,

why does this code not work properly ?

class arraywalktest
{
	var $testarray = array('a','b','c');
	var $test;

function arraywalktest()
{
	$this->test = 0;
}

function find()
{
	array_walk($this->testarray, array($this,"compare"));

	echo $this->test;
}

function compare($test)
{
	#some code doing something with the array
	echo "!";

	$this->test = 1;
}	
}

$test = new arraywalktest();

$test->find();

the output is !!!0 not !!!1.

Why can't i change $this->test while in function compare() ?

cu,
Hawk