regex url to image in php

Question

I am making a profile page where users can set an url to their profile image. How do I check this with regex for example?

What exactly are you intending to "check"? What are the criteria? — Lightness Races in Orbit, Jan 19 '11 at 12:29

score 1 · Answer 1 · answered Jan 19 '11 at 12:08

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You can't. Any file can be served at any address. You'd need to check the Content-Type returned by the URL, and probably the format of the image too.

answered Jan 19 '11 at 12:08

Joe

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Well, you might at least test that it's a valid URL. – Felix Dombek Jan 19 '11 at 12:55
If that's the real question then it's a dupe of http://stackoverflow.com/questions/206059/php-validation-regex-for-url – Joe Jan 19 '11 at 13:36

Matt Lowden · Accepted Answer · 2011-01-19T12:50:58.453

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You can use cURL for the mime. For the URL validation I use the following, but there are loads out there. You can use FILTER_VALIDATE_URL but it can contain bugs; http://bugs.php.net/51192.

$url='image.png';

if( preg_match("#((http|https|ftp)://(\S*?\.\S*?))(\s|\;|\)|\]|\[|\{|\}|,|\"|'|:|\<|$|\.\s)#ie", $url) ){

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_REFERER, 'http://yoursite.com');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    curl_exec($ch);
    $mime = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
    curl_close($ch);

    print $mime;

}

edited Jan 19 '11 at 12:50

answered Jan 19 '11 at 12:18

Matt Lowden

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the preg_match seems to block valid urls like "http://www.itavisen.no/gfx/speedometerNy.png" – ganjan Jan 19 '11 at 12:33
I've updated it, as there were some other errors with it. I generally prefer that URLs are prefixed with HTTP. Personal preference :) but I use this for URLs that will be placed into the href of the HTML base tag. – Matt Lowden Jan 19 '11 at 12:55

score 1 · Answer 3 · edited May 23 '17 at 12:02

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Have you seen this?

best way to determine if a URL is an image in PHP

edited May 23 '17 at 12:02

Community

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answered Jan 19 '11 at 15:07

Spaceghost

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score 0 · Answer 4 · edited May 23 '17 at 10:33

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You can use FILTER_VALIDATE_URL.

Look at : parsing url - php, check if scheme exists, validate url regex

edited May 23 '17 at 10:33

Community

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answered Jan 19 '11 at 12:08

LaGrandMere

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score 0 · Answer 5 · answered Jan 19 '11 at 12:11

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First test that is a valid url with filter_var()

$url = filter_var($variable, FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED);

Then you'll need to download the resource, and test locally if it's an image.

answered Jan 19 '11 at 12:11

Xavier Barbosa

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regex url to image in php

5 Answers5