Description:
------------
__set is not called if the property is called by reference

Reproduce code:
---------------
<?php
class Test {
        private $properties;
        function __construct() {
                $this->properties = array();
        }
        function __set($name, $value) {
                echo "setting $name\n";
                $this->properties[$name] = $value;
        }
        function __get($name) {
                echo "getting $name\n";
                return ($this->properties[$name]);
        }
}
$test = new Test;
$test->array = array("foo");
array_push($test->array, "bar");
print_r($test->array);
?>


Expected result:
----------------
setting property
getting property
setting property
getting property
Array ( 
    [0] => foo 
    [1] => bar 
)

Actual result:
--------------
setting property
getting property
getting property
Array ( 
    [0] => foo 
    [1] => bar
)