使用xpath和DOMDocument检索元素 [英] Retrieve elements with xpath and DOMDocument

问题描述

我在下面的html代码中有一个广告列表。
我需要的是一个PHP循环，以获取每个广告的以下元素：

I have a list of ads in the html code below. What I need is a PHP loop to get the folowing elements for each ad:

1. ad URL（href属性为< a> 标记）


2. 广告图片网址（< img> 标签）


3. 广告标题（< div class = title> 标签的html内容）

1. ad URL (href attribute of <a> tag)
2. ad image URL (src attribute of <img> tag)
3. ad title (html content of <div class="title"> tag)

<div class="ads">
    <a href="http://path/to/ad/1">
        <div class="ad">
            <div class="image">
                <div class="wrapper">
                    <img src="http://path/to/ad/1/image.jpg">
                </div>
            </div>
            <div class="detail">
                <div class="title">Ad #1</div>
            </div>
        </div>
    </a>
    <a href="http://path/to/ad/2">
        <div class="ad">
            <div class="image">
                <div class="wrapper">
                    <img src="http://path/to/ad/2/image.jpg">
                </div>
            </div>
            <div class="detail">
                <div class="title">Ad #2</div>
            </div>
        </div>
    </a>
</div>

我设法通过下面的PHP代码获取了广告网址。

I managed to get the ad URL with the PHP code below.

$d = new DOMDocument();
$d->loadHTML($ads); // the variable $ads contains the HTML code above
$xpath = new DOMXPath($d);
$ls_ads = $xpath->query('//a');

foreach ($ls_ads as $ad) {
    $ad_url = $ad->getAttribute('href');
    print("AD URL : $ad_url");
}

但是我没有设法获得另外2个元素（图像url和标题）。知道吗？

But I didn't manage to get the 2 other elements (image url and title). Any idea?

推荐答案

通过此代码（基于Khue Vu的代码），我设法获得了所需的东西：

I managed to get what I need with this code (based on Khue Vu's code) :

$d = new DOMDocument();
$d->loadHTML($ads); // the variable $ads contains the HTML code above
$xpath = new DOMXPath($d);
$ls_ads = $xpath->query('//a');

foreach ($ls_ads as $ad) {
    // get ad url
    $ad_url = $ad->getAttribute('href');

    // set current ad object as new DOMDocument object so we can parse it
    $ad_Doc = new DOMDocument();
    $cloned = $ad->cloneNode(TRUE);
    $ad_Doc->appendChild($ad_Doc->importNode($cloned, True));
    $xpath = new DOMXPath($ad_Doc);

    // get ad title
    $ad_title_tag = $xpath->query("//div[@class='title']");
    $ad_title = trim($ad_title_tag->item(0)->nodeValue);

    // get ad image
    $ad_image_tag = $xpath->query("//img/@src");
    $ad_image = $ad_image_tag->item(0)->nodeValue;
}

这篇关于使用xpath和DOMDocument检索元素的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！