那些遇到过的问题

使用 PHP 解析 XML 以获取 WordPress 产品列表

ewi*_*ard 1 php xml parsing object

我正在尝试使用 PHP 解析 XML 文件，以便可以替换某个标签的值。

相关 XML 如下所示：

<channel>
    <item>
        <title>Woo Logo</title>
        <link>http://demo2.woothemes.com/woocommerce/product/woo-logo/</link>
        <pubDate>Fri, 07 Jun 2013 10:35:51 +0000</pubDate>
        <dc:creator>wooteam</dc:creator>
        <guid isPermaLink="false">http://demo2.woothemes.com/dummydata/?post_type=product&#038;p=15</guid>
        <description></description>
        <content:encoded><![CDATA[Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.]]></content:encoded>
        <excerpt:encoded><![CDATA[Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.]]></excerpt:encoded>
        <wp:post_id>15</wp:post_id>
        <wp:post_date>2013-06-07 10:35:51</wp:post_date>
        <wp:post_date_gmt>2013-06-07 10:35:51</wp:post_date_gmt>
        <wp:comment_status>open</wp:comment_status>
        <wp:ping_status>closed</wp:ping_status>
        <wp:post_name>woo-logo</wp:post_name>
        <wp:status>publish</wp:status>
        <wp:post_parent>0</wp:post_parent>
        <wp:menu_order>0</wp:menu_order>
        <wp:post_type>product</wp:post_type>
        <wp:post_password></wp:post_password>
        <wp:is_sticky>0</wp:is_sticky>
        <category domain="product_cat" nicename="clothing"><![CDATA[Clothing]]></category>
        <category domain="product_type" nicename="simple"><![CDATA[simple]]></category>
        <category domain="product_cat" nicename="t-shirts"><![CDATA[T-shirts]]></category>
        <wp:postmeta>
            <wp:meta_key>_edit_last</wp:meta_key>
            <wp:meta_value><![CDATA[3]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_thumbnail_id</wp:meta_key>
            <wp:meta_value><![CDATA[16]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_visibility</wp:meta_key>
            <wp:meta_value><![CDATA[visible]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_stock_status</wp:meta_key>
            <wp:meta_value><![CDATA[instock]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>total_sales</wp:meta_key>
            <wp:meta_value><![CDATA[0]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_downloadable</wp:meta_key>
            <wp:meta_value><![CDATA[no]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_virtual</wp:meta_key>
            <wp:meta_value><![CDATA[no]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_product_image_gallery</wp:meta_key>
            <wp:meta_value><![CDATA[17]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_regular_price</wp:meta_key>
            <wp:meta_value><![CDATA[20]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_sale_price</wp:meta_key>
            <wp:meta_value><![CDATA[18]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_tax_status</wp:meta_key>
            <wp:meta_value><![CDATA[]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_tax_class</wp:meta_key>
            <wp:meta_value><![CDATA[]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_purchase_note</wp:meta_key>
            <wp:meta_value><![CDATA[]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_featured</wp:meta_key>
            <wp:meta_value><![CDATA[no]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_weight</wp:meta_key>
            <wp:meta_value><![CDATA[]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_length</wp:meta_key>
            <wp:meta_value><![CDATA[]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_width</wp:meta_key>
            <wp:meta_value><![CDATA[]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_height</wp:meta_key>
            <wp:meta_value><![CDATA[]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_sku</wp:meta_key>
            <wp:meta_value><![CDATA[]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_product_attributes</wp:meta_key>
            <wp:meta_value><![CDATA[a:0:{}]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_sale_price_dates_from</wp:meta_key>
            <wp:meta_value><![CDATA[]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_sale_price_dates_to</wp:meta_key>
            <wp:meta_value><![CDATA[]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_price</wp:meta_key>
            <wp:meta_value><![CDATA[18]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_sold_individually</wp:meta_key>
            <wp:meta_value><![CDATA[]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_stock</wp:meta_key>
            <wp:meta_value><![CDATA[5]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_backorders</wp:meta_key>
            <wp:meta_value><![CDATA[no]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_manage_stock</wp:meta_key>
            <wp:meta_value><![CDATA[yes]]></wp:meta_value>
        </wp:postmeta>
        <wp:postmeta>
            <wp:meta_key>_upsell_ids</wp:meta_key>
            <wp:meta_value><![CDATA[a:1:{i:0;s:2:"60";}]]></wp:meta_value>
        </wp:postmeta>
        <wp:comment>
            <wp:comment_id>13</wp:comment_id>
            <wp:comment_author><![CDATA[Cobus Bester]]></wp:comment_author>
            <wp:comment_author_email>bester.c@gmail.com</wp:comment_author_email>
            <wp:comment_author_url></wp:comment_author_url>
            <wp:comment_author_IP>196.215.9.147</wp:comment_author_IP>
            <wp:comment_date>2013-06-07 11:57:05</wp:comment_date>
            <wp:comment_date_gmt>2013-06-07 11:57:05</wp:comment_date_gmt>
            <wp:comment_content><![CDATA[Simple and effective design. One of my favorites.]]></wp:comment_content>
            <wp:comment_approved>1</wp:comment_approved>
            <wp:comment_type></wp:comment_type>
            <wp:comment_parent>0</wp:comment_parent>
            <wp:comment_user_id>0</wp:comment_user_id>
            <wp:commentmeta>
                <wp:meta_key>akismet_error</wp:meta_key>
                <wp:meta_value><![CDATA[1370606225]]></wp:meta_value>
            </wp:commentmeta>
            <wp:commentmeta>
                <wp:meta_key>akismet_history</wp:meta_key>
                <wp:meta_value><![CDATA[a:4:{s:4:"time";d:1370606225.6765859127044677734375;s:7:"message";s:92:"Akismet was unable to check this comment (response: ), will automatically retry again later.";s:5:"event";s:11:"check-error";s:4:"user";s:0:"";}]]></wp:meta_value>
            </wp:commentmeta>
            <wp:commentmeta>
                <wp:meta_key>akismet_as_submitted</wp:meta_key>
                <wp:meta_value><![CDATA[a:67:{s:15:"comment_post_ID";i:15;s:14:"comment_author";s:12:"Cobus Bester";s:20:"comment_author_email";s:18:"bester.c@gmail.com";s:18:"comment_author_url";N;s:15:"comment_content";s:49:"Simple and effective design. One of my favorites.";s:12:"comment_type";s:0:"";s:14:"comment_parent";i:0;s:7:"user_ID";i:0;s:7:"user_ip";s:13:"196.215.9.147";s:10:"user_agent";s:119:"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_3) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.65 Safari/537.31";s:8:"referrer";s:56:"http://demo2.woothemes.com/woocommerce/product/woo-logo/";s:4:"blog";s:38:"http://demo2.woothemes.com/woocommerce";s:9:"blog_lang";s:5:"en_US";s:12:"blog_charset";s:5:"UTF-8";s:9:"permalink";s:56:"http://demo2.woothemes.com/woocommerce/product/woo-logo/";s:21:"akismet_comment_nonce";s:6:"passed";s:11:"POST_author";s:12:"Cobus Bester";s:10:"POST_email";s:18:"bester.c@gmail.com";s:11:"POST_rating";s:1:"4";s:12:"POST_comment";s:49:"Simple and effective design. One of my favorites.";s:7:"POST__n";s:10:"a80bd2f042";s:21:"POST__wp_http_referer";s:30:"/woocommerce/product/woo-logo/";s:11:"POST_submit";s:13:"Submit Review";s:20:"POST_comment_post_ID";s:2:"15";s:19:"POST_comment_parent";s:1:"0";s:26:"POST_akismet_comment_nonce";s:10:"bbd941e9bf";s:15:"SERVER_SOFTWARE";s:6:"Apache";s:11:"REQUEST_URI";s:33:"/woocommerce/wp-comments-post.php";s:15:"REDIRECT_IS_WPE";s:1:"1";s:27:"REDIRECT_WPE_CAN_WRITE_DISK";s:1:"0";s:15:"REDIRECT_STATUS";s:3:"200";s:6:"IS_WPE";s:1:"1";s:18:"WPE_CAN_WRITE_DISK";s:1:"0";s:9:"HTTP_HOST";s:19:"demo2.woothemes.com";s:13:"HTTP_X_LB_KEY";s:8:"woodemo2";s:13:"HTTP_X_IS_BOT";s:1:"0";s:15:"HTTP_USER_AGENT";s:119:"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_3) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.65 Safari/537.31";s:15:"HTTP_CONNECTION";s:5:"close";s:14:"CONTENT_LENGTH";s:3:"273";s:18:"HTTP_CACHE_CONTROL";s:9:"max-age=0";s:11:"HTTP_ACCEPT";s:63:"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";s:11:"HTTP_ORIGIN";s:26:"http://demo2.woothemes.com";s:12:"CONTENT_TYPE";s:33:"application/x-www-form-urlencoded";s:12:"HTTP_REFERER";s:56:"http://demo2.woothemes.com/woocommerce/product/woo-logo/";s:20:"HTTP_ACCEPT_ENCODING";s:17:"gzip,deflate,sdch";s:20:"HTTP_ACCEPT_LANGUAGE";s:14:"en-US,en;q=0.8";s:19:"HTTP_ACCEPT_CHARSET";s:30:"ISO-8859-1,utf-8;q=0.7,*;q=0.3";s:11:"HTTP_COOKIE";s:0:"";s:4:"PATH";s:28:"/usr/local/bin:/usr/bin:/bin";s:16:"SERVER_SIGNATURE";s:0:"";s:11:"SERVER_NAME";s:19:"demo2.woothemes.com";s:11:"SERVER_ADDR";s:9:"127.0.0.1";s:11:"SERVER_PORT";s:2:"80";s:11:"REMOTE_ADDR";s:13:"196.215.9.147";s:13:"DOCUMENT_ROOT";s:26:"/nas/wp/www/sites/woodemo2";s:12:"SERVER_ADMIN";s:18:"[no address given]";s:15:"SCRIPT_FILENAME";s:47:"/nas/wp/www/sites/woodemo2/wp-comments-post.php";s:11:"REMOTE_PORT";s:5:"57596";s:12:"REDIRECT_URL";s:33:"/woocommerce/wp-comments-post.php";s:17:"GATEWAY_INTERFACE";s:7:"CGI/1.1";s:15:"SERVER_PROTOCOL";s:8:"HTTP/1.0";s:14:"REQUEST_METHOD";s:4:"POST";s:12:"QUERY_STRING";s:0:"";s:11:"SCRIPT_NAME";s:21:"/wp-comments-post.php";s:8:"PHP_SELF";s:21:"/wp-comments-post.php";s:12:"REQUEST_TIME";s:10:"1370606225";s:25:"comment_post_modified_gmt";s:19:"2013-06-07 11:15:25";}]]></wp:meta_value>
            </wp:commentmeta>
            <wp:commentmeta>
                <wp:meta_key>rating</wp:meta_key>
                <wp:meta_value><![CDATA[4]]></wp:meta_value>
            </wp:commentmeta>
            <wp:commentmeta>
                <wp:meta_key>akismet_history</wp:meta_key>
                <wp:meta_value><![CDATA[a:4:{s:4:"time";d:1370607940.89634990692138671875;s:7:"message";s:46:"wooteam changed the comment status to approved";s:5:"event";s:15:"status-approved";s:4:"user";s:7:"wooteam";}]]></wp:meta_value>
            </wp:commentmeta>
        </wp:comment>
    </item>
</channel>
Run Code Online (Sandbox Code Playgroud)

wp:postmeta我对与价格有关的块感兴趣- 与 相关的块<wp:meta_key>_price</wp:meta_key>。这是我尝试做的：

$dom=new DOMDocument();
$dom->load("/var/www/wp-content/plugins/woocommerce/dummy-data/nspro.xml");

$root=$dom->documentElement;

$markers=$root->getElementsByTagName('item');

echo $markers->item(0)->getElementsByTagName('wp:postmeta')->item(22)->getElementsByTagName('wp:meta_key')->item(0)->textContent;
Run Code Online (Sandbox Code Playgroud)

这不起作用 - 我收到此错误：

Fatal error: Call to a member function getElementsByTagName() on a non-object.
Run Code Online (Sandbox Code Playgroud)

错误是在 后引用我对该函数的调用$markers->item(0)->getElementsByTagName('wp:postmeta')->item(22)->。显然，我不能像引用<item>列表中的第一个时那样使用它。如何访问<wp:postmeta>块内的标签？

ThW*_*ThW 5

您没有在示例 XML 中发布相关内容。文档元素包含命名空间定义（xmlns:*属性）。您要查找的数据位于该xmlns:wp属性定义的命名空间中。

您可以使用 Xpath 以更简单、更稳定的方式获取数据。

$dom = new DOMDocument();
$dom->loadXML($xml);
// create an XPath instance
$xpath = new DOMXpath($dom);
// register a prefix for the wordpress export namespace
$xpath->registerNamespace('wp', 'http://wordpress.org/export/1.0/');

// fetch all rss item element nodes and iterate them
foreach ($xpath->evaluate('//item') as $item) {
  // get the price meta data as a number
  var_dump(
    $xpath->evaluate(
      'number(.//wp:postmeta[wp:meta_key = "_price"]/wp:meta_value)',
      $item
    )
  );
}
Run Code Online (Sandbox Code Playgroud)

演示：https ://eval.in/188516

输出：

float(18)
Run Code Online (Sandbox Code Playgroud)

现在，如果您想编辑某些内容，您需要将其作为节点获取。如果 Xpath 表达式是位置路径，它将始终返回节点列表，与 getElementsByTagName() 非常相似。您可以检查列表是否包含值，但我更喜欢在 Xpath 中进行限制并仅使用 foreach()。

// inside the item loop
$priceNodes = $xpath->evaluate(
  './/wp:postmeta[wp:meta_key = "_price"][1]/wp:meta_value', $item
);
foreach ($priceNodes as $priceNode) {
  $newPrice = 42; 
  $priceNode->nodeValue = (int)$newPrice;
}
Run Code Online (Sandbox Code Playgroud)

演示：https ://eval.in/188529

请小心 DOMNode::$nodeValue。仅设置不能包含&. PHP 这里有一个错误。否则使用它来删除所有子节点并附加一个新的文本节点。

$priceNode->nodeValue = '';
$priceNode->appendChild($dom->createTextNode($newPrice));
Run Code Online (Sandbox Code Playgroud)

归档时间：

查看次数：

3686 次

最近记录：

10 年，10 月 前
相关归档
如何检查IP地址在PHP的两个IP范围内？ 51
给我一个Binary Parser.二进制数据的解析器 21
wordpress中的网站在迁移后重定向到旧URL 21
Laravel:路径中间件和策略之间的区别 20
XQuery特定目录下的所有文件？ 13
如何在PHP中释放内存？ 9
Amazon Product API:具有多个ASIN的ItemLookup 5
平铺 Android XML Drawable 5
java对象类型中的正确封装是什么 4
Python对象持有对象的dict() 0
难疑归档
如何在Python中安全地创建嵌套目录？ 3909
何时在Java中使用LinkedList而不是ArrayList？ 2974
如何在JavaScript中检查"undefined"？ 2294
你如何合并两个Git存储库？ 1517
ORM(对象关系映射)中的"N + 1选择问题"是什么？ 1507
如何使用jQuery获取元素的ID？ 1320
如何从另一个分支中获取一个文件 1154
如何随机化(shuffle)一个JavaScript数组？ 1138
endsWith在JavaScript中 1085
什么是首选的Bash shebang？ 1051