CODEWITHSUNDEEP
php
Ali Gajani
Ali Gajani

Reputation: 15089

Extracting links from a piece of text in PHP except ignoring image links

I have this piece of text, and I want to extract links from this. Some links with have tags and some will be out there just like that, in plain format. But I also have images, and I don't want their links.

How would I extract links from this piece of text but ignoring image links. So basically and google.com should both be extract. 

string(441) "<p class="fr-tag">Please visit&nbsp;https://www.google.co.uk/?gfe_rd=cr&ei=9P2DVaW2BMWo8wfK74HYCg and this <a href="https://www.google.co.uk/?gfe_rd=cr&ei=9P2DVaW2BMWo8wfK74HYCg" rel="nofollow">link</a>&nbsp;should be filtered and this&nbsp;http://d.pr/i/1i2Xu&nbsp;<img class="fr-fin fr-tag" alt="Image title" src="https://cft-forum.s3-us-west-2.amazonaws.com/uploads%2F1434714755338-Screen+Shot+2015-06-19+at+12.52.28.png" width="300"></p>"

I have tried the following but its incomplete:

    $dom = new DOMDocument();
    $dom->loadHTML($html);

    $tags = $dom->getElementsByTagName('a');
    foreach ($tags as $tag) {
    $hrefs[] =  $tag->getAttribute('href');

Upvotes: 0

Views: 204

Answers (3)

the_pete
the_pete

Reputation: 822

I played around with this a lot more and have an answer that may better suit what you are trying to do with a bit of "future proofing"

$str =  '<p class="fr-tag">Please visit&nbsp;www.google.co.uk/?gfe_rd=cr&ei=9P2DVaW2BMWo8wfK74HYCg and this <a href="https://www.google.co.uk/?gfe_rd=cr&ei=9P2DVaW2BMWo8wfK74HYCg" rel="nofollow">link</a>&nbsp;should be filtered and this&nbsp;http://d.pr/i/1i2Xu&nbsp;<img class="fr-fin fr-tag" alt="Image title" src="https://cft-forum.s3-us-west-2.amazonaws.com/uploads%2F1434714755338-Screen+Shot+2015-06-19+at+12.52.28.png" width="300"></p>';
$str = str_replace('&nbsp;',' ',$str);
$strArr = explode(' ',$str);
$len =  count($strArr);

for($i = 0; $i < $len; $i++){
    if(stristr($strArr[$i],'http') || stristr($strArr[$i],"www")){
        $matches[] = $strArr[$i];
    }
}

echo "<pre>";
print_r($matches);
echo "</pre>";

I went back and analyzed your string and noticed that if you translate the &nbsp; to spaces you can then explode the string into an array, step through that and if any elements contain http or www then add them to the $matches array to be processed later. The output is pretty clean and easy to work with and you also get rid of most of the html markup this way.

Something to note is that this probably isn't the best way to do this. I haven't tested with any other strings but the one you offered so there's optimization that can be done.

Upvotes: -1

the_pete
the_pete

Reputation: 822

Using just that one string to test, the following works for me:

$str =  '<p class="fr-tag">Please visit&nbsp;https://www.google.co.uk/?gfe_rd=cr&ei=9P2DVaW2BMWo8wfK74HYCg and this <a href="https://www.google.co.uk/?gfe_rd=cr&ei=9P2DVaW2BMWo8wfK74HYCg" rel="nofollow">link</a>&nbsp;should be filtered and this&nbsp;http://d.pr/i/1i2Xu&nbsp;<img class="fr-fin fr-tag" alt="Image title" src="https://cft-forum.s3-us-west-2.amazonaws.com/uploads%2F1434714755338-Screen+Shot+2015-06-19+at+12.52.28.png" width="300"></p>';

preg_match('~a href="(.*?)"~', $str, $strArr);

Using a href ="..." in the preg_match() statement returns an array, $strArr containing two values, the two links to google.

Array
(
    [0] => a href="https://www.google.co.uk/?gfe_rd=cr&ei=9P2DVaW2BMWo8wfK74HYCg"
    [1] => https://www.google.co.uk/?gfe_rd=cr&ei=9P2DVaW2BMWo8wfK74HYCg
)

Upvotes: 1

luckyape
luckyape

Reputation: 722

I would try something like this.

Find and remove images tags:

$content = preg_replace("/<img[^>]+\>/i", "(image) ", $content);

Find and collect URLs.

preg_match_all('#\bhttps?://[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/))#', $content, $match);

Output Urls:

print_r($match);

Good luck!

Upvotes: 1

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