如果重定向发生,如何在file_get_contents之后获取真实的URL？

function getRealURL($url, $maxRedirects = 10) {
    $content = file_get_contents($url);
    $redirects = 0;
    
    while ($redirects < $maxRedirects) {
        $headers = get_headers($url, 1);
        
        if (isset($headers['Location'])) {
            $url = $headers['Location'];
            $content = file_get_contents($url);
            $redirects++;
        } else {
            break;
        }
    }
    
    return $url;
}

$realURL = getRealURL('https://example.com');
echo $realURL;