这个xPath有点帮助吗？

Question

I am getting some info from an RSS.

<?php
$dom = new DOMDocument;
libxml_use_internal_errors(TRUE);
$dom->load('http://www.myrss.com');
libxml_clear_errors();

$xPath = new DOMXPath($dom);
$links = $xPath->query('xxxxx');
foreach($links as $link) {
    printf("%s 
", $link->nodeValue);
}
?>

I have managed to get the TITLE, LINK and DESCRIPTION with //item/title and so on, howver I want to get the text content and image of description seperated.

As I can see through page source using firefox this is the code I see for image and the content. Both are in <description></description>

IMAGE

<div class="separator" style="clear: both; text-align: center;"><a href="LINK TO IMAGE" imageanchor="1" 
style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="192" 
src="LINK TO IMAGE" width="320" /></a></div>

CONTENT TEXT

<span class="Apple-style-span" style="font-family: 'Trebuchet MS', sans-serif;"> CONTENT TEXT IS HERE </span>

What xPath should I use to get those data? Thank you

Answer 1

If it is what it looks like and the content is HTML-encoded, you can't do it in one step. You must retrieve every description text and parse into its own DOM (unless you want to resort to regex, which I would strongly discourage).

When in doubt, you can pass it through Tidy before. DOMDocument has loadHTML(), which is pretty resilient, but it is not guaranteed that it can load any HTML.

// beware, this is untested. it should give you an idea, though.

$dom = new DOMDocument;
libxml_use_internal_errors(TRUE);

$dom->load('http://www.myrss.com');
libxml_clear_errors();

$xPath = new DOMXPath($dom);
$items = $xPath->query('/rss/channel/item');

foreach($items as $item) {
    $descr = $xPath->query('./description', $item);
    // there should be at most one, but foreach gracefully
    // handles the case where there is no <description>
    foreach ($descr as $d) {
        $temp_dom = new DOMDocument();
        $temp_dom->loadHTML( $d->nodeValue );   // error handling/Tidy here!

        $temp_xpath = new DOMXPath($temp_dom);

        $img = $temp_xpath->query('//img');
        $txt = $temp_xpath->query('//span[@class="Apple-style-span"]');

        // now do something with $img and $txt
    }

}