调用未定义的方法DOMDocument :: getElementsByClassName（） [英] Call to undefined method DOMDocument::getElementsByClassName()

问题描述

我正在尝试从以下img标签中获取alt标签...

I am trying to fetch the alt tag from the following img tag...

<div class="localImage">

    <a href="/Electronic-Deals/b/ref=amb_link_185249707_2?ie=UTF8&amp;node=4192584031&amp;pf_rd_m=A1VBAL9TL5WCBF&amp;pf_rd_s=center-new-12&amp;pf_rd_r=07C4YQ4KZ15MZJQBT2PD&amp;pf_rd_t=701&amp;pf_rd_p=736512207&amp;pf_rd_i=20">

    <img src="http://g-ecx.images-amazon.com/images/G/31/rcx-events/cat-navs-electronics1._V335880105_.png" alt="Electronics" border="0" height="140" width="170"></a>

    </div>

为此，我尝试了以下代码...

For this I have tried the following code...

$dom = new DOMDocument();

@$dom->loadHTML($html2);

  foreach($dom->getElementsByClassName("localImage") as $tr) {

$name = '';

foreach($tr->getElementsByTagName('img') as $i)
{
$name = $i->getAttribute('alt');
}
echo $name;

但是我收到以下错误...

But am getting the following error...

Call to undefined method DOMDocument::getElementsByClassName()

任何人都可以帮助我找到错误的地方，因为我以前尝试过这个代码模式，但从来没有面对过这样的问题。

Can anyone please help me where am getting it wrong...as I have tried this code pattern earlier but never faced such issue earlier.

推荐答案

类 DOMDocument 不包含方法 getElementsByClassName

使用 xpath

$xpath = new DOMXpath($dom);
$xpath->query('//div[contains(@class, "localImage")]'); //instance of DOMNodeList

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