CODEWITHSUNDEEP
php
Adrian.S
Adrian.S

Reputation: 209

Using preg_match and str_replace to verify link

I'm building a simple blog script that allows the users to put html in the content (I'm using htmlpurifier). I want the users to be able to post image urls, but only from imgur. How can I best approach this method using preg_match and str_replace?

Example. If image url is not from imgur then use str_replace and delete it.

After playing around with DOMDocument (Jack adviced on the chat to use DOM instead) I came up with the solution to my own question. 

// let's pretend <img src="" /> is inside content
$content = $_POST['content'];

$doc = new DOMDocument;
libxml_use_internal_errors(true);
$doc->loadHTML($content);
libxml_clear_errors();

foreach ($doc->getElementsByTagName('img') as $img) {
    if (parse_url($img->getAttribute('src'), PHP_URL_HOST) != 'i.imgur.com') {
    $content = preg_replace("/<img[^>]+\>/i", "(invalid image provider) ", $content); 
    echo $content;
    } else {
        echo $content;
    }
}

Upvotes: 1

Views: 150

Answers (1)

Ja͢ck
Ja͢ck

Reputation: 173642

Assuming you have the URL:

$host = parse_url($url, PHP_URL_HOST);
$suffix = 'imgur.com';
if (substr_compare($host, $suffix, -strlen($suffix)) != 0) {
    // not an imgur.com link
}

Upvotes: 1

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