使用PHP DOM文档，按类选择HTML元素并获取文本

问题描述：

我试图通过使用具有以下HTML（相同结构）和以下代码的PHP DOM元素，从div class = 'review-text'中获取文本。

I trying to get text from div where class = 'review-text', by using PHP's DOM element with following HTML (same structure) and following code.

然而，这似乎并不奏效
$ b

However this doesn't seem to work

HTML p>

HTML

$html = '
    <div class="page-wrapper">
        <section class="page single-review" itemtype="http://schema.org/Review" itemscope="" itemprop="review">
            <article class="review clearfix">
                <div class="review-content">
                    <div class="review-text" itemprop="reviewBody">
                    Outstanding ... 
                    </div>
                </div>
            </article>
        </section>
    </div>
';

PHP代码

PHP Code

    $classname = 'review-text';
    $dom = new DOMDocument;
    $dom->loadHTML($html);
    $xpath     = new DOMXPath($dom);
    $results = $xpath->query("//*[@class and contains(concat(' ', normalize-space(@class), ' '), ' $classname ')]");

    if ($results->length > 0) {
        echo $review = $results->item(0)->nodeValue;
    }

在此博客中提供了按类别选择元素的XPATH语法

The XPATH syntax to select element by Class is provided at this Blog

我尝试了很多来自*的在线教程示例，但似乎没有任何效果。我错过了什么？

I have tried many example from *, online tutorials, but none seems to work. Am I missing something ?

答

以下XPath查询完成您想要的功能。只需将提供给$ xpath-> query的参数替换为以下内容即可：

The following XPath query does what you want. Just replace the argument provided to $xpath->query with the following:

//div[@class="review-text"]

编辑：
为了便于开发，您可以测试自己的XPath查询的在线 http://www.xpathtester.com/test 。

编辑2 ：
测试了这段代码;它完美地工作。

Tested this code; it worked perfectly.

<?php

$html = '
    <div class="page-wrapper">
        <section class="page single-review" itemtype="http://schema.org/Review" itemscope="" itemprop="review">
            <article class="review clearfix">
                <div class="review-content">
                    <div class="review-text" itemprop="reviewBody">
                    Outstanding ... 
                    </div>
                </div>
            </article>
        </section>
    </div>
';

$classname = 'review-text';
$dom = new DOMDocument;
$dom->loadHTML($html);
$xpath = new DOMXPath($dom);
$results = $xpath->query("//*[@class='" . $classname . "']");

if ($results->length > 0) {
    echo $review = $results->item(0)->nodeValue;
}

?>

使用PHP DOM文档，按类选择HTML元素并获取文本

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