Use cURL download file when CURLOPT_FOLLOWLOCATION cannot be activated when safe_mode is enabled or an open_basedir is set

<php
error_reporting(E_ALL);
ini_set('display_errors', 1);
$url = 'https://graph.facebook.com/402381083277804/picture';
$ch = curl_init($url);
$content = curl_exec_follow($ch);
curl_close($ch);
if ($content) {
  $ret = file_put_contents('ok.jpg', $content);
}

function curl_exec_follow($ch, &$maxredirect = null) {

  // we emulate a browser here since some websites detect
  // us as a bot and don't let us do our job
  $user_agent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5)".
                " Gecko/20041107 Firefox/1.0";
  curl_setopt($ch, CURLOPT_USERAGENT, $user_agent );

  $mr = $maxredirect === null ? 5 : intval($maxredirect);

  if (filter_var(ini_get('open_basedir'), FILTER_VALIDATE_BOOLEAN) === false
      && filter_var(ini_get('safe_mode'), FILTER_VALIDATE_BOOLEAN) === false
  ) {

    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, $mr > 0);
    curl_setopt($ch, CURLOPT_MAXREDIRS, $mr);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

  } else {
 
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);

    if ($mr > 0)
    {
      $original_url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
      $newurl = $original_url;
   
      $rch = curl_copy_handle($ch);
   
      curl_setopt($rch, CURLOPT_HEADER, true);
      curl_setopt($rch, CURLOPT_NOBODY, true);
      curl_setopt($rch, CURLOPT_FORBID_REUSE, false);
      do
      {
        curl_setopt($rch, CURLOPT_URL, $newurl);
        $header = curl_exec($rch);
        if (curl_errno($rch)) {
          $code = 0;
        } else {
          $code = curl_getinfo($rch, CURLINFO_HTTP_CODE);
          if ($code == 301 || $code == 302) {
            preg_match('/Location:(.*?)\n/i', $header, $matches);
            $newurl = trim(array_pop($matches));
         
            // if no scheme is present then the new url is a
            // relative path and thus needs some extra care
            if(!preg_match("/^https?:/i", $newurl)){
              $newurl = $original_url . $newurl;
            }
          } else {
            $code = 0;
          }
        }
      } while ($code && --$mr);
   
      curl_close($rch);
   
      if (!$mr)
      {
        if ($maxredirect === null)
        trigger_error('Too many redirects.', E_USER_WARNING);
        else
        $maxredirect = 0;
     
        return false;
      }
      curl_setopt($ch, CURLOPT_URL, $newurl);
    }
  }
  return curl_exec($ch);
}