Description:
------------
Can't call variable objects. Where as in PHP 4 you can!!

Reproduce code:
---------------
class bug_test {
function bug_test() {
//create a test var
$this->test_var = 'hello world';
}
function echo_test_var() {
echo $this->test_var;
}
function say_hello() {
$object = 'this';
$$object->echo_test_var();
}
}

//let show this bug!!
$test = new bug_test();
$test->say_hello();

Expected result:
----------------
Should print "hello world to screen"

Actual result:
--------------
Notice: Undefined variable: this in c:\www\php_newrust\bug.php on line 20

Fatal error: Call to a member function echo_test_var() on a non-object in c:\www\php_newrust\bug.php on line 20