PHP array Reference Bug ?

Answer 1

What you probably want is this:

class MyStack{
    /* ... */

    /* Store a non-reference */
    public function push($elem) {
        $this->_storage[] = $elem;
    }

    /* return a reference */
    public function &top(){
        return $this->_storage[count($this->_storage)-1];
    }

    /* ...*/
}

/* You must also ask for a reference when calling */
/* ... */
$t = &$stack->top();
$t[] = 2;