我想提取所有'a'标签，其中'img'标签使用php驻留，但我无法弄明白

$urlContent = file_get_contents('http://www.techeblog.com/');

$dom = new DOMDocument();

@$dom->loadHTML($urlContent);

$domPath=new DOMXpath($dom);

$linkList = $domPath->evaluate("/html/body/a/img");

foreach ($linkList as $link) 

  {

        echo $link->getAttribute("src")."<br />";   

  }

Your XPath expression will only return image tags that are inside links that are direct children of the body tag. If you want all link tags that contain images anywhere in the document, use the expression //a[img]

That being said, you may want to be more specific about which images you pull. This expression will limit the results to links containing images that are inside the blog entries //div[@class="entry"]//a[img].

Here is a great XPath cheat sheet.

<?php

$urlContent = file_get_contents('http://www.techeblog.com/');

$dom = new DOMDocument();

@$dom->loadHTML($urlContent);

$domPath=new DOMXpath($dom);

$linkList = $domPath->evaluate('//div[@class="entry"]//a[img]');

foreach ($linkList as $link)
{
    echo $link->getAttribute("href").PHP_EOL;
}

Also, your echo is looking for an attribute calles src, which will not be present in the links.