static scope problems ??

[PHPycho]

Hello forums!!
I had the following code running under the php5 server(With E_STRICT error reporting)
Code:

<?php
class Test{
	private static $list;

private function __construct(){

}

public static function set_msg($msg)
{
	self::$list[] = $msg;
}

public static function reset_msg()
{
	unset(self::$list);
}

public static function get_msg()
{
	return self::$list;
}

public static function test1(msg)
{
	self::set_msg($msg);		
}

public static function test2(msg)
{
	self::set_msg($msg);		
}

}
?>

Accessing portion:

<?php
// including class goes here..
Test::test1("Message1");
Test::test2("Message2");
print_r(Test::get_msg());
Test::reset_msg(); // this gives the error : "Fatal error: Attempt to unset static property Test::$list"
?>

Why did such error occur ? I didnt get any idea. Can anybody give a hint ?

Thanks in advance to all of you

[Weedpacket]

"Doctor, it hurts when I do this."
"Don't do that then."

I don't think you want to destroy the property (which is what unset() would do if it worked, so it's a good thing it deliberately doesn't), just remove its contents. I think you just want to set it to null. Or, better yet, array(), because that's what you're using it for.