PHP如何将XML文件内容解析并存储到变量中？

$string = <<<xml
<?xml version="1.0" encoding="utf-8" ?>
<returnsms>
    <returnstatus>status</returnstatus>
    <message>message</message>
    <remainpoint> remainpoint</remainpoint>
    <taskid>taskid</taskid>
    <successcounts>successcounts</successcounts>
</returnsms>
xml;

$xmlresult = simplexml_load_string($string);

$xml_l = array();
foreach ($xmlresult->children() as $childitem) {
    $xml_l[] = array(
        "name" => $childitem->getname(),
        "value" => $childitem-> __tostring()
    );
}

print_r($xml_l);

Array
(
    [0] => Array
        (
            [name] => returnstatus
            [value] => status
        )

    [1] => Array
        (
            [name] => message
            [value] => message
        )

    [2] => Array
        (
            [name] => remainpoint
            [value] =>  remainpoint
        )

    [3] => Array
        (
            [name] => taskID
            [value] => taskID
        )

    [4] => Array
        (
            [name] => successCounts
            [value] => successCounts
        )

)