Get content from url after redirected

Question

I am trying to set up a tool to get someone's Twitter ID without using twitter's API.

In my example, my username is quixthe2nd.

So if you enter someone's twitter username in this link:

https://twitter.com/quixthe2nd/profile_image?size=original

It would redirect to:

https://pbs.twimg.com/profile_images/1116692743361687553/0P-dk3sF.jpg

The ID is 1116692743361687553. It is listed after https://pbs.twimg.com/profile_images/.

My code is:

$url = "https://twitter.com/quixthe2nd/profile_image?size=original";
function get_redirect_target($url)
{
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $headers = curl_exec($ch);
    curl_close($ch);
    // Check if there's a Location: header (redirect)
    if (preg_match('/^Location: (.+)$/im', $headers, $matches))
        return trim($matches[1]);
    // If not, there was no redirect so return the original URL
    // (Alternatively change this to return false)
    return $url;
}
function get_redirect_final_target($url)
{
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); // follow redirects
    curl_setopt($ch, CURLOPT_AUTOREFERER, 1); // set referer on redirect
    curl_exec($ch);
    $target = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
    curl_close($ch);
    if ($target)
        return $target;
    return false;
}


    $s = $target;
    if(preg_match('/profile_images\/\K[^\/]+/',$s,$matches)) {
        print($matches[0]);
    }

My code doesn't output anything. How would I be able grab that via PHP?

Answer 1

You can use this regex and grab your value from group1,

profile_images\/([^\/]+)

Regex Demo

Alternatively, you can use \K so your full match is your intended text.

profile_images\/\K[^\/]+

Regex Demo using \K

PHP Code Demo

$s = "https://pbs.twimg.com/profile_images/1116692743361687553/0P-dk3sF.jpg";
if(preg_match('/profile_images\/\K[^\/]+/',$s,$matches)) {
    print($matches[0]);
} else {
    echo "Didn\'t match";
}

Prints,

1116692743361687553