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function append_sid($url, $params = false, $is_amp = true, $session_id = false)
{
	global $_SID, $_EXTRA_URL, $phpbb_hook;
global $phpbb_root_path, $phpEx;
	if ($url === "{$phpbb_root_path}index.$phpEx")
	{
		return append_sid($phpbb_root_path);
	}

//if(stripos($params,"redirect") != false)
//{
//preg_match("/redirect(.*)$/",$params,$addit);
$params = preg_replace("/(?|&|&)redirect=(.*)$/","",$params);
//$addit="redirect".$addit[1];
//}
if(stripos($url,".php") != false ){//&& stripos($url,"adm/") == false){
$isphp = true;
}else{
$isphp = false;
}



if($isphp == true){
$url = str_replace(".php","", $url);
$url = str_replace("?",",", $url);
$url = str_replace("&",",", $url);
$url = str_replace("&",",", $url);
$url = str_replace("=",".", $url);
$params = str_replace("?",",", $params);
$params = str_replace("&",",", $params);
$params = str_replace("&",",", $params);
$params = str_replace("=",".", $params);
}
	// Developers using the hook function need to globalise the $_SID and $_EXTRA_URL on their own and also handle it appropiatly.
	// They could mimick most of what is within this function
	if (!empty($phpbb_hook) && $phpbb_hook->call_hook(__FUNCTION__, $url, $params, $is_amp, $session_id))
	{
		if ($phpbb_hook->hook_return(__FUNCTION__))
		{
			return $phpbb_hook->hook_return_result(__FUNCTION__);
		}
	}


	// Assign sid if session id is not specified
if ($session_id === false)
{
   $session_id = $_SID;
}

global $user;
if ($user->data['user_id'] == ANONYMOUS OR $user->data['is_bot'] )
{
   $session_id = false;
}


	if($isphp == true){
  $amp_delim = ",";
  $url_delim = ",";
  $amp2_delim = ($is_amp) ? '&' : '&';
  $url2_delim = (strpos($url, '?') === false) ? '?' : $amp_delim;
  }else{
  $amp_delim = ($is_amp) ? '&' : '&';
	$url_delim = (strpos($url, '?') === false) ? '?' : $amp_delim;
  }
	// Appending custom url parameter?
	$append_url = (!empty($_EXTRA_URL)) ? implode($amp_delim, $_EXTRA_URL) : '';

	$anchor = '';
	if (strpos($url, '#') !== false)
	{
		list($url, $anchor) = explode('#', $url, 2);
		$anchor = '#' . $anchor;
	}
	else if (!is_array($params) && strpos($params, '#') !== false)
	{
		list($params, $anchor) = explode('#', $params, 2);
		$anchor = '#' . $anchor;
	}

	// Use the short variant if possible ;)
	if ($params === false)
	{
		// Append session id
		if (!$session_id)
		{
      if($isphp == true){
			return $url . (($append_url) ? $url_delim . $append_url : '') . ".html" . (($addit) ? "?".$addit : ''). $anchor;
			}else{
			return $url . (($append_url) ? $url_delim . $append_url : '') . $anchor;
			}
		}
		else
		{
      if($isphp == true){
			return $url . (($append_url) ? $url_delim . $append_url :'') ."html".(($addit) ? "?".$addit.$amp2_delim : "?").'sid=' . $session_id . $anchor;
			}else{
			return $url . (($append_url) ? $url_delim . $append_url . $amp_delim : $url_delim) . 'sid=' . $session_id . $anchor;
			}
		}
	}

	// Build string if parameters are specified as array
	if (is_array($params))
	{
		$output = array();

		foreach ($params as $key => $item)
		{
			if ($item === NULL)
			{
				continue;
			}

			if ($key == '#')
			{
				$anchor = '#' . $item;
				continue;
			}
      if($isphp == true){
			$output[] = $key . '_' . $item;
			}else{
			$output[] = $key . '=' . $item;
			}
		}

		$params = implode($amp_delim, $output);
	}

	// Append session id and parameters (even if they are empty)
	// If parameters are empty, the developer can still append his/her parameters without caring about the delimiter
	if($isphp == true){
	return $url . (($append_url) ? $url_delim . $append_url . $amp_delim : (($params) ? $url_delim : '')) . $params . ".html". (($addit) ? "?".$addit : "") . ((!$session_id) ? '' : (($addit) ? $amp2_delim : "?") . 'sid=' . $session_id) . $anchor;
  }else{
  return $url . (($append_url) ? $url_delim . $append_url . $amp_delim : $url_delim) . $params . ((!$session_id) ? '' : "?" . 'sid=' . $session_id) . $anchor;
  }
}