Php Xpath选择文本_Php_Html_Xml_Xpath

Php Xpath选择文本

php html xml xpath

Php Xpath选择文本,php,html,xml,xpath,Php,Html,Xml,Xpath,我一直在玩xpath，当我选择段落时，我可以让它工作，但是这篇文章似乎不起作用这是html <span id="favorite_count" style="display: block;"> <span style="cursor:help; border-bottom: 1px dotted black;" title="Active members who have made you their favorite. This number may change

我一直在玩xpath，当我选择段落时，我可以让它工作，但是这篇文章似乎不起作用

这是html

<span id="favorite_count" style="display: block;">
    <span style="cursor:help; border-bottom: 1px dotted black;" title="Active members who have made you their favorite.  This number may change as new members join, or close their accounts.">My total number of <span class="favorites">:</span>
    </span> 
19458
</span>

注:

我知道这与上面这条线有关，因为当我使用

$favorites   = $data->xpath( '//span[@id="favorite_count"]/span' );

我得到的结果，我的总数

此外，我无法更改HTML，因为它来自我无权修改的页面。

HTML代码：

 <html>
    <head></head>
    <body>
        <span id="favorite_count" style="display: block;">
            <span style="cursor:help; border-bottom: 1px dotted black;" title="Active members who have made you their favorite. This number may change as new members join, or close their accounts.">My total number of <span class="favorites">:</span>
            </span> 
            19458
        </span>
    </body>
</html>

PHP代码：

 /* Use internal libxml errors -- turn on in production, off for debugging */
libxml_use_internal_errors(true);
/* Createa a new DomDocument object */
$dom = new DomDocument;
/* Load the HTML */
$dom->loadHTMLFile("test.html");
/* Create a new XPath object */
$xpath = new DomXPath($dom);
/* Query all <td> nodes containing specified class name */
$nodes = $xpath->query("//*[@id='favorite_count']/text()");
/* Set HTTP response header to plain text for debugging output */
header("Content-type: text/plain");
/* Traverse the DOMNodeList object to output each DomNode's nodeValue */
foreach ($nodes as $i => $node) {
    echo "Node($i): ", $node->nodeValue, "\n";
}

输出：

节点0：

节点1：

19458

您正在使用SimpleXML库。它无法使用其方法选择textnodes

要使其正常工作，需要扩展SimpleXMLElement并动态采用结果。在它的姐妹库的帮助下，这很容易实现

示例代码：

echo (new DOMXpath(
   dom_import_simplexml(
      simplexml_load_string($html)
   )->ownerDocument
))->evaluate('normalize-space(//span[@id="favorite_count"]/text()[last()])');

程序输出：

19458

演示：

在您非常具体的情况下，您还可以直接使用SimpleXML执行以下操作：

echo trim($xml->xpath('//span[@id="favorite_count"]')[0]);

这是因为内部确实隐藏了实际的节点值，但它只返回空格、行分隔符和数字19458