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php - 来自 mobile.de 的 SimpleXMLElement 和 XML 数据的问题

问题描述

我尝试从 mobile.de 获取 xml 数据来准备我的插件数据。返回的 XML 如下所示：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    <reference:reference xmlns:seller="http://services.mobile.de/schema   /seller"
                     xmlns:ad="http://services.mobile.de/schema/ad"
                     xmlns:financing="http://services.mobile.de/schema/common/financing-1.0"
                     xmlns:reference="http://services.mobile.de/schema/reference"
                     xmlns:resource="http://services.mobile.de/schema/resource">
    <reference:item key="Cabrio" url="https://services.mobile.de/refdata/classes/Car/categories/Cabrio">
        <resource:local-description xml-lang="en">Cabriolet / Roadster</resource:local-description>
    </reference:item>
    <reference:item key="EstateCar" url="https://services.mobile.de/refdata/classes/Car/categories/EstateCar">
        <resource:local-description xml-lang="en">Estate Car</resource:local-description>
    </reference:item>
    <reference:item key="Limousine" url="https://services.mobile.de/refdata/classes/Car/categories/Limousine">
        <resource:local-description xml-lang="en">Saloon</resource:local-description>
    </reference:item>
    <reference:item key="OffRoad" url="https://services.mobile.de/refdata/classes/Car/categories/OffRoad">
        <resource:local-description xml-lang="en">SUV/Off-road Vehicle/Pickup Truck</resource:local-description>
    </reference:item>
    <reference:item key="SmallCar" url="https://services.mobile.de/refdata/classes/Car/categories/SmallCar">
        <resource:local-description xml-lang="en">Small Car</resource:local-description>
    </reference:item>
    <reference:item key="SportsCar" url="https://services.mobile.de/refdata/classes/Car/categories/SportsCar">
        <resource:local-description xml-lang="en">Sports Car/Coupe</resource:local-description>
    </reference:item>
    <reference:item key="Van" url="https://services.mobile.de/refdata/classes/Car/categories/Van">
        <resource:local-description xml-lang="en">Van/Minibus</resource:local-description>
    </reference:item>
    <reference:item key="OtherCar" url="https://services.mobile.de/refdata/classes/Car/categories/OtherCar">
        <resource:local-description xml-lang="en">Other</resource:local-description>
    </reference:item>
</reference:reference>

我试图遍历节点，但似乎 SimpleXML 无法解析这个 xml。

这是我的php代码：

public function getReferenceXML($url) {
        //url e.g : https://services.mobile.de/refdata/classes/Car/categories

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_FAILONERROR, 1);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_URL, $url);

        $data = htmlspecialchars_decode(curl_exec($ch));
        curl_close($ch);

        $file = EAZY_CLASSIC_CARS_ROOT_DIR . basename($url) . '.xml';

        if (file_exists($file)) {
            unlink($file);
        }

        file_put_contents($file, $data);

        $xml = simplexml_load_file($file);

        echo $xml->count();

        echo '</br>';

        print_r($xml->getNamespaces());

        die();
        //return $xml;
    }

这是 echo 和 print_r 调用的输出：

0
Array ( [reference] => http://services.mobile.de/schema/reference )

我需要在 SimpleXML 对象上设置一个特定的命名空间吗？

我很感激任何答案，因为我真的被卡住了......

我需要参考的关键值：项目和资源：本地描述值

标签： phpcurlsimplexml

解决方案

一种选择可能是使用 xpath 并在查询中使用命名空间并遍历结果：

/reference:reference/reference:item

对于每个项目，使用此查询获取返回数组的第一个条目

./resource:local-description

请注意，对象是SimpleXMLElement类型，您必须使用__toString()或将它们强制转换为 a(string)以获取字符串内容

例如：

foreach($xml->xpath("/reference:reference/reference:item") as $item) {
    $key = (string)$item->attributes()["key"];
    $description = (string)$item->xpath("./resource:local-description")[0];
    echo "Key: " . $key . PHP_EOL;
    echo "Description " . $description . PHP_EOL;
    echo PHP_EOL;
}

输出

Key: Cabrio
Description Cabriolet / Roadster

Key: EstateCar
Description Estate Car

Key: Limousine
Description Saloon

Key: OffRoad
Description SUV/Off-road Vehicle/Pickup Truck

Key: SmallCar
Description Small Car

Key: SportsCar
Description Sports Car/Coupe

Key: Van
Description Van/Minibus

Key: OtherCar
Description Other

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