base_url returns wrong value when there is substring of server name in the url

[am05mhz]

base_url function returns wrong value when there is a substring of server name in the url. eg:

request_url: localhost/pico/local -> base_url = host/pico/ (pico installed in pico subfolder)
request_url: localhost/local -> base_url = host/
request_url: www.technology.com/tech -> base_url = www.nology.com/

solution:

private function base_url()
{
    global $config;
    if(isset($config['base_url']) && $config['base_url']) return $config['base_url'];

    $url = '';
    $request_url = (isset($_SERVER['REQUEST_URI'])) ? $_SERVER['REQUEST_URI'] : '';
    $script_url  = (isset($_SERVER['PHP_SELF'])) ? $_SERVER['PHP_SELF'] : '';
    if($request_url != $script_url) $url = trim(preg_replace('/'. str_replace('/', '\/', str_replace('index.php', '', $script_url)) .'/', '', $request_url, 1), '/');

    $protocol = $this->get_protocol();
    return $protocol . '://' . rtrim(str_replace('/'.$url, '/', $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']), '/');
}

[PhrozenByte]

Fixed with #252