Description:
------------
When functions are defined inside a class, the function seems to undefine itself outside the class.

Reproduce code:
---------------
<?php
class Cart {
    var $items;  // Items in our shopping cart

    // Add $num articles of $artnr to the cart

    function add_item($artnr, $num) {
        $this->items[$artnr] += $num;
    }

    // Take $num articles of $artnr out of the cart

    function remove_item($artnr, $num) {
        if ($this->items[$artnr] > $num) {
            $this->items[$artnr] -= $num;
            return true;
        } elseif ($this->items[$artnr] == $num) {
            unset($this->items[$artnr]);
            return true;
        } else {
            return false;
        }
    }
}
add_item(1,12);
print_r($this);
?> 

Expected result:
----------------
Cart Object (
	[items] => Array (
		[1] => 12
	)
)

Actual result:
--------------
Fatal error: Call to undefined function add_item() in F:\webdocs\cp.php on line 25