如何从PHP中的tumlbr rss源获取第一张图像

Question

0Here is the relevant part of my rss feed:

    <channel>
        <description></description>
        <title>Untitled</title>
        <generator>Tumblr (3.0; @xxx)</generator>
        <link>http://xxx.tumblr.com/</link> 
        <item>
            <title>Title</title>
            <description>&lt;figure&gt;&lt;img src="https://31.media.tumblr.com/c78c7t3abd23423549d3bb0f705/tumblr_inline_nkp9z234d0uj.jpg"/&gt;&lt;/figure&gt;</description>
            <link>http://xxx.tumblr.com/post/99569244093</link>
            <guid>http://xxx.tumblr.com/post/99569244093</guid>
            <pubDate>Thu, 09 Oct 2014 11:19:33 -0400</pubDate>
        </item>
    </channel>

Using the answer from other questions on here I tried this:

$content = file_get_contents("http://xxx.tumblr.com/rss"); 
$feed = new SimpleXmlElement($content); 
$imgs = $feed->channel->item[0]->description->xpath('//img');
    foreach($imgs as $image) {
            echo (string)$image['src'];     
};

This is returning an empty array for $imgs

Does it have something to do with the tags being < > etc?

and if so what can I do?

Answer 1

You can get it from the description, which seems to include a HTML image tag for the image, by using a simple regular expression with preg_match:

$content = file_get_contents("http://xxx.tumblr.com/rss");
$feed    = new SimpleXmlElement($content);
$img     = (string)$feed->channel->item[0]->description;

if (preg_match('/src="(.*?)"/', $img, $matches)) {
    $src = $matches[1];
    echo "src = $src", PHP_EOL;
}

Output:

src = http://40.media.tumblr.com/58d24c3009638514325b113859ba369f/tumblr_nk0mwfhKXU1sl87kjo1_500.jpg