How I get the value of "rel" attribute from the html view source using php?

Question

I want the value of the rel attribute of the anchor tag associated with the search domain.

I have to change the domain "blog.zeit.de/berlinjournal" instead of "http://blog.zeit.de/berlinjournal/". Use this domain and find out rel Val

@Sam Onela, code not working for this domain. Please help me to solve this error.

My code is:

$domain = 'blog.zeit.de/berlinjournal';
$handle = fopen($domain, 'r');
$content = stream_get_contents($handle);
fclose($handle);
if ((strpos($content, $domain) !== false)) {
        echo 'true'; // true if $domain found in view source content
}

Get the clear idea in blow image

is this your site? if not and you are allowed to scrape it, just use `DOMDocument` — Kevin, Apr 11 '17 at 05:40
@Angel it appears that the HTML of the page changed so that link no longer exists. Is there a different link you can target? — Sᴀᴍ Onᴇᴌᴀ, Apr 26 '17 at 16:14
Hmm I don't see any anchor tags with just the single attribute `rel="nofollow"` ... but I do see `Ruben Ballutschinski` ... do you want to find that one? — Sᴀᴍ Onᴇᴌᴀ, Apr 26 '17 at 16:24
@SamOnela, I want rel="nofollow" value, problem is that when I search domain in HTML view source without "http://" then It will return nothing, but with http:// it will work fine. — Puja, Apr 27 '17 at 04:20
Like I said, the HTML appears to have been updated and there are only two anchor tags with a **rel** attribute containing _nofollow_. Can you use one of those? `Ruben Ballutschinski` or `wowereilusconi` — Sᴀᴍ Onᴇᴌᴀ, Apr 27 '17 at 15:29
@SamOnela, What you said I can't understand but my requirement is, For ex. In HTML view source I search the domain name "http://rballutschinski.wordpress.com/". it's rel value is "nofollow" so I want just searchable URL rel value nothing else — Puja, Apr 28 '17 at 04:16

score 1 · Accepted Answer · edited Jun 20 '20 at 09:12

Create an instance of DOMDocument, call the loadHTML() method, then use simplexml_import_dom() to get an instance of a SimpleXMLElement, on which the xpath() method can be used to query for that anchor tag.

You may also notice warnings printed to the screen when loading the html. To set it to use the internal error handler, use libxml_use_internal_errors(true); - thanks to @dewsworld for this answer.

libxml_use_internal_errors(true);
$doc = new DOMDocument();
$doc->loadHTML($content);
$xml = simplexml_import_dom($doc);
$results = $xml->xpath("//a[@href='$domain']");
if (sizeof($results)) {
    echo 'rel: '.$results[0]['rel'].'<br>';
}

See it demonstrated in this phpfiddle.

Update

Since the HTML of the original URL has changed and the requirement is now to find the rel attribute of a different anchor tag, that can be done with the contains() xpath function.

$searchDomain = 'rballutschinski.wordpress.com/';
if ((strpos($content, $searchDomain) !== false)) {
    $doc = new DOMDocument();
    $doc->loadHTML($content);
    $xml = simplexml_import_dom($doc);
    $results = $xml->xpath("//a[contains(@href,'$searchDomain')]");
    if (sizeof($results)) {
        $rel = $results[0]['rel'];
    }

See a demonstration in this phpfiddle.

your code is working well bt when I m using my $searchdomin = https://www.paintyourlife.com/watercolor-portraits.php and $domain = http://www.messhall.org/contemporary-watercolour-portrait-artists-who-have-changed-the-face-of-portraits/ then it will give me an error.. I put my code in https://pastebin.com/j4E7nAYQ plz help me to solve this error.. Thank you — Puja, Jun 01 '17 at 05:33
if you are seeing another error that you are not familiar with, and don't find any documentation on it, then perhaps [ask another question](https://stackoverflow.com/questions/ask). — Sᴀᴍ Onᴇᴌᴀ, Jun 01 '17 at 15:14

How I get the value of "rel" attribute from the html view source using php?

1 Answers1

Update