SimpleXml foreach：ignore元素

Question

        <?php

    $xml = "<articles>
    <article id=\"18357302\">
    <articleCategories>
    <articleCategory id=\"default\"/>
    <articleCategory id=\"66607\"/>
    </articleCategories>
    </article>
    </articles>";

    $feed = simplexml_load_string($xml);

    $items = $feed->article;
    foreach ($items as $article) {

    //  $categorie = $article->articleCategories->articleCategory[id];
    $categories = $article->articleCategories;
    print_r($categories);
    echo "<br>print_r indeed returns an array, but impossible to echo it using foreach!!!<br>";
    foreach ($categories->id as $category) {
if ($category != "default") {
        echo $category;
}
    }
    }
    ?>

不确定我做错了什么，我只想找到一种方法来删除articleCategories中默认值的部分

<articleCategory id=\"default\"/>

脚本需要忽略这部分，只需使用XML文件中的下一篇articleCategory，我宁愿避免使用正则表达式删除它

Answer 1

脚本遍历articleCategories标记。 但它需要迭代articleCategory标记。

以下更改就足够了。

foreach ($categories->articleCategory as $category) {
    if ($category["id"] != "default") {
        echo $category["id"];
    }
}