Description:
------------
When we used virtual variables exploiting __set overload method, we encountered errors.

Reproduce code:
---------------
	class TheObj {
		public $RealVar1, $RealVar2, $RealVar3, $RealVar4;
		public $Var = array();

		function __set($var, $val) {
			$this->Var[$var] = $val;
		}
		function __get($var) {
			if(isset($this->Var[$var])) return $this->Var[$var];
			else return -1;
		}
	}

	$SomeObj = new TheObj;

	// this will fine
	$SomeObj->RealVar1 = 'somevalue';
	$SomeObj->{'RealVar2'} = 'othervalue';
	$SomeObj->{'RealVar'.(3)} = 'othervaluetoo';
	$SomeObj->{'RealVar'.'4'} = 'anothervalue';

	// this will fine too
	$SomeObj->Virtual1 = 'somevalue';
	$SomeObj->{'Virtual2'} = 'othervalue';

	// it's can't be used since this will encounter error
	$SomeObj->{'Virtual'.(3)} = 'othervaluetoo';
	$SomeObj->{'Virtual'.'4'} = 'anothervalue';

	// but this will fine, ofcourse
	$SomeObj->Var['Virtual'.(3)] = 'othervaluetoo';
	$SomeObj->Var['Virtual'.'4'] = 'anothervalue';

Expected result:
----------------
No error when we use below lines:
<?php
	$SomeObj->{'Virtual'.(3)} = 'othervaluetoo';
	$SomeObj->{'Virtual'.'4'} = 'anothervalue';
?>
because this should applied fine as we did at "RealVarX" treatments.

Actual result:
--------------
Encountered error raises by php.exe