simplexml_load_string奇怪的解析和对象转换

Question

将以下结构作为XML：

<USERS COUNT="3" >
    <USER FIRST_NAME="asdsd" ROLEID="10" EMAIL="blub2@fasel.com" STATUS="ACTIVE" LAST_NAME="asda" USERID="100" >
        <LOCATION LOCATIONID="9" NAME="Test Users" SORT_ORDER="0" ></LOCATION>
    </USER>
    <USER FIRST_NAME="gffgh" ROLEID="10" EMAIL="blub@fasel.de" STATUS="ACTIVE" LAST_NAME="fghfgh" USERID="99" >
        <LOCATION LOCATIONID="9" NAME="Test Users" SORT_ORDER="0" ></LOCATION>
    </USER>
    <USER FIRST_NAME="Hilmi" ROLEID="8" EMAIL="xxx@xxx.com" STATUS="ACITVE" LAST_NAME="xxx" USERID="98" >
        <LOCATION LOCATIONID="9" NAME="Test Users" SORT_ORDER="0" ></LOCATION>
    </USER>
</USERS>

这一行

simplexml_load_string($data, 'SimpleXMLElement', LIBXML_NOCDATA);

产生以下对象：

SimpleXMLElement Object
(    
    [USERS] => SimpleXMLElement Object
        (
            [@attributes] => Array
                (
                    [COUNT] => 3
                )

            [USER] => Array
                (
                    [0] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (
                                    [FIRST_NAME] => asdsd
                                    [ROLEID] => 10
                                    [EMAIL] => blub2@fasel.com
                                    [STATUS] => ACTIVE
                                    [LAST_NAME] => asda
                                    [USERID] => 100
                                )

                            [0] => SimpleXMLElement Object
                                (
                                    [@attributes] => Array
                                        (
                                            [LOCATIONID] => 9
                                            [NAME] => Test Users
                                            [SORT_ORDER] => 0
                                        )

                                )

                        )

                    [1] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (
                                    [FIRST_NAME] => gffgh
                                    [ROLEID] => 10
                                    [EMAIL] => blub@fasel.de
                                    [STATUS] => ACTIVE
                                    [LAST_NAME] => fghfgh
                                    [USERID] => 99
                                )

                            [0] => SimpleXMLElement Object
                                (
                                    [@attributes] => Array
                                        (
                                            [LOCATIONID] => 9
                                            [NAME] => Test Users
                                            [SORT_ORDER] => 0
                                        )
                                )
                        )

                    [2] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (
                                    [FIRST_NAME] => Hilmi
                                    [ROLEID] => 8
                                    [EMAIL] => xxx@xxx.com
                                    [STATUS] => ACITVE
                                    [LAST_NAME] => Hilmiev
                                    [USERID] => 98
                                )

                            [LOCATION] => SimpleXMLElement Object
                                (
                                    [@attributes] => Array
                                        (
                                            [LOCATIONID] => 9
                                            [NAME] => Test Users
                                            [SORT_ORDER] => 0
                                        )
                               )
                        )
                )
        )
)

<LOCATION>子元素＃1和＃2转换为[0]和[1]，最后一个（始终只是最后一个）转换为[LOCATION] < / p>

PHP版本5.5.14

我本来期待像

这样的东西

SimpleXMLElement Object
(    
    [USERS] => SimpleXMLElement Object
        (
            [@attributes] => Array
                ...

            [USER] => Array
                (
                    [0] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (
                                    ...
                                )

                            [LOCATION] => SimpleXMLElement Object

表示所有子元素。

有没有人对此有解释？