PHP with DOMXPath - 如何 select 并从此 html 树计数

Question

我需要统计这些项目有多少是开放的，它们有四种类型：简单、中等、困难和不想要。所有这些类型都是 div 中的值。我需要从计数中排除 'Not-Wanted' 类型。请注意 'Open' 和 'Close' 值周围有不同数量的空格。这是 html 结构：

<table>
    <tbody>
        <tr>
            <td>
                <div>Difficult</div>
            </td>
            <td>Name</td>
            <td>  Open </td>
        </tr>
        <tr>
            <td>
                <div>Easy</div>
            </td>
            <td>Name</td>
            <td> Closed  </td>
        </tr>
        <tr>
            <td>
                <div>Easy</div>
            </td>
            <td>Name</td>
            <td>   Open   </td>
        </tr>
        <tr>
            <td>
                <div>Medium</div>
            </td>
            <td>Name</td>
            <td>Open </td>
        </tr>
        <tr>
            <td>
                <div>Easy</div>
            </td>
            <td>Name</td>
            <td> Open     </td>
        </tr>
        <tr>
            <td>
                <div>Medium</div>
            </td>
            <td>Name</td>
            <td>  Closed</td>
        </tr>
        <tr>
            <td>
                <div>Easy</div>
            </td>
            <td>Name</td>
            <td>Closed </td>
        </tr>
        <tr>
            <td>
                <div>Not-wanted</div>
            </td>
            <td>Name</td>
            <td> Open </td>
        </tr>
        <tr>
            <td>
                <div>Difficult</div>
            </td>
            <td>Name</td>
            <td>Open</td>
        </tr>
        ............

这是我解决问题的尝试之一。明明是错的，就是不知道怎么改正。

$doc = new DOMDocument();
$doc->loadHtmlFile('http://www.nameofsite.com');
$doc->preserveWhiteSpace = false;
$xpath = new DOMXPath($doc);

$elements = $xpath->query("/html/body/div[1]/div/section/div/section/article/div/div[1]/div/div/div[2]/div[1]/div[2]/div/section/div/div/table/tbody/tr");

$count = 0;
foreach ($elements as $element) {
    if ($element->childNodes->nodeValue != 'Not-wanted') {
        if ($element->childNodes->nodeValue === 'open') {
            $count++;
        }
    }
}

echo $count;

我对 DOMXPath 有非常基本的了解，所以它对我来说太复杂了，因为我只能创建简单的查询。

有人可以帮忙吗？

提前致谢。

Answer 1

根据您示例中的数据，我认为您可以将 xpath 表达式调整为此以获得所有符合您条件的 <tr>：

//table/tbody/tr[normalize-space(td[3]/text()) = 'Open' and td[1]/div/text() != 'Not-wanted']

$elements 是 DOMNodeList 类型，然后您可以获取 length 属性以获取列表中的节点数。

例如：

$source = <<<SOURCE
<table>
    <tbody>
        <tr>
            <td>
                <div>Difficult</div>
            </td>
            <td>Name</td>
            <td>  Open </td>
        </tr>
        <tr>
            <td>
                <div>Easy</div>
            </td>
            <td>Name</td>
            <td> Closed  </td>
        </tr>
        <tr>
            <td>
                <div>Easy</div>
            </td>
            <td>Name</td>
            <td>   Open   </td>
        </tr>
        <tr>
            <td>
                <div>Medium</div>
            </td>
            <td>Name</td>
            <td>Open </td>
        </tr>
        <tr>
            <td>
                <div>Easy</div>
            </td>
            <td>Name</td>
            <td> Open     </td>
        </tr>
        <tr>
            <td>
                <div>Medium</div>
            </td>
            <td>Name</td>
            <td>  Closed</td>
        </tr>
        <tr>
            <td>
                <div>Easy</div>
            </td>
            <td>Name</td>
            <td>Closed </td>
        </tr>
        <tr>
            <td>
                <div>Not-wanted</div>
            </td>
            <td>Name</td>
            <td> Open </td>
        </tr>
        <tr>
            <td>
                <div>Difficult</div>
            </td>
            <td>Name</td>
            <td>Open</td>
        </tr>
    </tbody>
</table>
SOURCE;

$doc = new DOMDocument();
$doc->loadHTML($source);
$doc->preserveWhiteSpace = false;
$xpath = new DOMXPath($doc);
$elements = $xpath->query("//table/tbody/tr[normalize-space(td[3]/text()) = 'Open' and td[1]/div/text() != 'Not-wanted']");
echo $elements->length;

这将导致：

5

Demo

PHP with DOMXPath - 如何 select 并从此 html 树计数

PHP with DOMXPath - How to select and count from this html tree

php

domxpath