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php - 使用 php foreach 提取 XML 没有循环

问题描述

我正在尝试制作这个循环，但它只返回第一个值。

XML

<catalog>
<dd>
    <categoryassignment categoryid="3d-magic" productid="000000000000109330_PURPLE/ BLUE"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000109330_PURPLE/ BLUE/ ORANGE"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000109330_RED/ GREEN/ YELLOW"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000109335_BLUE/YELLOW"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000109335_PURPLE/ORANGE"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000115881_GREEN/PURPLE"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000115881_ORANGE/BLUE"/>

    <categoryassignment categoryid="3d-magic" productid="000000000000115881_RED/YELLOW"/>

    <categoryassignment categoryid="3d-magic" productid="000000000109329001"/>

    <categoryassignment categoryid="3d-magic" productid="000000000109329002"/>

    <categoryassignment categoryid="3d-magic" productid="000000000109335001"/>

    <categoryassignment categoryid="3d-magic" productid="000000000111568001"/>

    <categoryassignment categoryid="3d-magic" productid="000000000111568002"/>
</dd>

PHP

$xml=simplexml_load_file("store.xml") or die("Failed to create an object");

foreach($xml->children() as $books) { 
echo $books->categoryassignment['categoryid'];echo $books->categoryassignment['productid'];echo "<br>";}

从这里的例子：https ://www.w3schools.com/php/php_xml_simplexml_get.asp

标签： phpforeach

解决方案

您需要更改引用数据的方式。如果您首先通过执行以下操作进行快速调试：

print_r($xml);

你会看到你有一个像这样的对象：

SimpleXMLElement Object
(
    [dd] => SimpleXMLElement Object
        (
            [categoryassignment] => Array
                (
                    [0] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (
                                    [categoryid] => 3d-magic
                                    [productid] => 000000000000109330_PURPLE/ BLUE
                                )
                        )
                    [1] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (
                                    [categoryid] => 3d-magic
                                    [productid] => 000000000000109330_PURPLE/ BLUE/ ORANGE
                                )
                        )
         ... etc ...

有了这些知识，您就可以轻松查看需要将foreach. 它会是这样的（$books内部略有变化）：

foreach($xml->dd->categoryassignment as $books) { 
    echo $books['categoryid'];
    echo ' ';
    echo $books['productid'];
    echo "<br>\n";
}

结果是：

3d-magic 000000000000109330_PURPLE/ BLUE
3d-magic 000000000000109330_PURPLE/ BLUE/ ORANGE
3d-magic 000000000000109330_RED/ GREEN/ YELLOW
3d-magic 000000000000109335_BLUE/YELLOW
3d-magic 000000000000109335_PURPLE/ORANGE
3d-magic 000000000000115881_GREEN/PURPLE
3d-magic 000000000000115881_ORANGE/BLUE
3d-magic 000000000000115881_RED/YELLOW
3d-magic 000000000109329001
3d-magic 000000000109329002
3d-magic 000000000109335001
3d-magic 000000000111568001
3d-magic 000000000111568002

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