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?

Answer 1

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;

}