从 simpleXML 数组中获取元素

Question

我正在尝试从 simpleXML 数组中获取元素，但出于某种原因我无法调用它们。

这是数组。

Array
(
    [0] => SimpleXMLElement Object
        (
            [NameChangeIndicator] => N
            [NameChangeDate] => SimpleXMLElement Object
                (
                )

            [PreviousName] => SimpleXMLElement Object
                (
                )

            [Score] => 53
            [NumberOfSubs] => SimpleXMLElement Object
                (
                )

            [NumberOfJU] => SimpleXMLElement Object
                (
                )

            [DateLastJU] => SimpleXMLElement Object
                (
                )

            [NumberActPrincipals] => 1
            [NumberActPrincipalsJU] => SimpleXMLElement Object
                (
                )

            [LastestBankCode] => SimpleXMLElement Object
                (
                )

            [LastestBankCodeDate] => SimpleXMLElement Object
                (
                )

            [NumberRDs] => SimpleXMLElement Object
                (
                )

            [LiqIndicator] => SimpleXMLElement Object
                (
                )

            [TotEnqLast12Mth] => SimpleXMLElement Object
                (
                )

            [TotEnqLast3Mth] => SimpleXMLElement Object
                (
                )

            [RefsNoOfReferences] => SimpleXMLElement Object
                (
                )

            [RefsHighMthPurchases] => SimpleXMLElement Object
                (
                )

            [RefsHighMthPurchasesTermGiven] => SimpleXMLElement Object
                (
                )

            [RefsHighMthPurchasesTermTaken] => SimpleXMLElement Object
                (
                )

            [RefsLowMthPurchases] => SimpleXMLElement Object
                (
                )

            [RefsLowMthPurchasesTermGiven] => SimpleXMLElement Object
                (
                )

            [RefsLowMthPurchasesTermTaken] => SimpleXMLElement Object
                (
                )

            [KissNoOfSuppliers] => SimpleXMLElement Object
                (
                )

            [KissNoOfODSuppliers] => SimpleXMLElement Object
                (
                )

            [KissAmountOS] => SimpleXMLElement Object
                (
                )

            [KissAmountOD] => SimpleXMLElement Object
                (
                )

            [KissPercntage] => SimpleXMLElement Object
                (
                )

            [LatestBankCodeDesc] => SimpleXMLElement Object
                (
                )

            [HoldingCmpName] => SimpleXMLElement Object
                (
                )

        )

)

所以我正在执行以下调用以获取数组。

$new_str = htmlspecialchars_decode($str);
$new_str = str_replace('<?xml version="1.0" encoding="UTF-8"?>','',$new_str);
$xml = simplexml_load_string($new_str);
$dom = new SimpleXMLElement($new_str);
$xml_array = $dom->xpath("//*[name()='ReportSummary']");
echo "{$xml_array[0]['Score']}";

但是我无法将对象从数组中拉出。我不确定数组是否被正确地发回给我，因为如果我不解码字符串，我就得不到数组。奇怪的是，在数组中我一直看到 "SimpleXMLElement Object" 但我不确定这是否正确。

任何帮助将不胜感激。

Answer 1

正如转储输出所说，SimpleXML 是一种对象，而不是一种创建数组的方法。

这两行是同一件事的不同写法，你只需要其中一种即可；无论哪种情况，您最终都会得到一个 SimpleXMLElement 对象：

$xml = simplexml_load_string($new_str);
$xml = new SimpleXMLElement($new_str);

您看到的外部数组用于保存 XPath 查询的结果，因为它们可以来自 XML 树中的任何位置。它是 SimpleXMLElement 个对象的数组。

有关如何使用 SimpleXML 访问数据，请参阅 the basic usage page in the PHP manual。

在您的例子中，Score 是文档的一个元素，因此需要使用 $node->property 语法访问。

这是您的代码的整理版本：

$new_str = htmlspecialchars_decode($str);
// Are you sure the next line is necessary? That looks like a valid XML opening to me.
$new_str = str_replace('<?xml version="1.0" encoding="UTF-8"?>','',$new_str);

$xml = simplexml_load_string($new_str);

// I think this simpler XPath expression means the same as yours, but I might be wrong
$xpath_results = $xml->xpath('//ReportSummary');

// Beware that the XPath could return no matches, in which case the following 
// would give an error. Best to check count($xpath_results) > 0 first.
echo $xpath_results[0]->Score;

Answer 2

致 IMSoP：感谢您的帮助，但我不得不对其进行一些修改：

$dom = new SimpleXMLElement($new_str);
$xml_array = $dom->xpath("//*[name()='ReportSummary']");
echo $xml_array[0]->Score;

然后我得到了正确的结果，非常感谢！

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