Method loadSystemUris

/**
 * Method to load the system URI strings for the application.
 *
 * @param   string  $requestUri  An optional request URI to use instead of detecting one from the
 *                               server environment variables.
 *
 * @return  void
 *
 * @since   1.7.3
 */
protected function loadSystemUris($requestUri = null)
{
    // Set the request URI.
    if (!empty($requestUri)) {
        $this->set('uri.request', $requestUri);
    } else {
        $this->set('uri.request', $this->detectRequestUri());
    }
    // Check to see if an explicit base URI has been set.
    $siteUri = trim($this->get('site_uri', ''));
    if ($siteUri !== '') {
        $uri = Uri::getInstance($siteUri);
        $path = $uri->toString(array('path'));
    } else {
        // Start with the requested URI.
        $uri = Uri::getInstance($this->get('uri.request'));
        // If we are working from a CGI SAPI with the 'cgi.fix_pathinfo' directive disabled we use PHP_SELF.
        if (strpos(PHP_SAPI, 'cgi') !== false && !ini_get('cgi.fix_pathinfo') && !empty($_SERVER['REQUEST_URI'])) {
            // We aren't expecting PATH_INFO within PHP_SELF so this should work.
            $path = \dirname($_SERVER['PHP_SELF']);
        } else {
            $path = \dirname($_SERVER['SCRIPT_NAME']);
        }
    }
    $host = $uri->toString(array('scheme', 'user', 'pass', 'host', 'port'));
    // Check if the path includes "index.php".
    if (strpos($path, 'index.php') !== false) {
        // Remove the index.php portion of the path.
        $path = substr_replace($path, '', strpos($path, 'index.php'), 9);
    }
    $path = rtrim($path, '/\\');
    // Set the base URI both as just a path and as the full URI.
    $this->set('uri.base.full', $host . $path . '/');
    $this->set('uri.base.host', $host);
    $this->set('uri.base.path', $path . '/');
    // Set the extended (non-base) part of the request URI as the route.
    if (stripos($this->get('uri.request'), $this->get('uri.base.full')) === 0) {
        $this->set('uri.route', substr_replace($this->get('uri.request'), '', 0, \strlen($this->get('uri.base.full'))));
    }
    // Get an explicitly set media URI is present.
    $mediaURI = trim($this->get('media_uri', ''));
    if ($mediaURI) {
        if (strpos($mediaURI, '://') !== false) {
            $this->set('uri.media.full', $mediaURI);
            $this->set('uri.media.path', $mediaURI);
        } else {
            // Normalise slashes.
            $mediaURI = trim($mediaURI, '/\\');
            $mediaURI = !empty($mediaURI) ? '/' . $mediaURI . '/' : '/';
            $this->set('uri.media.full', $this->get('uri.base.host') . $mediaURI);
            $this->set('uri.media.path', $mediaURI);
        }
    } else {
        $this->set('uri.media.full', $this->get('uri.base.full') . 'media/');
        $this->set('uri.media.path', $this->get('uri.base.path') . 'media/');
    }
}