Description:
------------
Hello, when casting a SimpleXMLObject to an array, if the object is empty it remains a SimpleXmlObject, and if the object contains only one value it is converted to a string.

(array) <value /> = simpleXmlObject()
(array) <value>1</value> = "1"
(array) <value>1</value><value>2</value> = array("1","2")

Reproduce code:
---------------
<?php

$s[] = "<root><foo><value /></foo></root>";
$s[] = "<root><foo><value>1</value></foo></root>";
$s[] = "<root><foo><value>1</value><value>2</value></foo></root>";

foreach($s as $sKey=>$xml_string) {
	$o = simplexml_load_string($xml_string);
	$a = (array)$o->foo;
	echo $sKey." = "; print_r($a); echo "\n\n<br /><br />";
}
?>

Expected result:
----------------
0 = Array ( [value] => Array ( ) )

1 = Array ( [value] => Array ( [0] => 1 ) )

2 = Array ( [value] => Array ( [0] => 1 [1] => 2 ) ) 

Actual result:
--------------
0 = Array ( [value] => SimpleXMLElement Object ( ) )

1 = Array ( [value] => 1 )

2 = Array ( [value] => Array ( [0] => 1 [1] => 2 ) )