Horde_Ldap::startTLS PHP Метод

    public function startTLS()
    {
        /* First try STARTTLS blindly, some servers don't even allow to receive
         * the rootDSE without TLS. */
        if (@ldap_start_tls($this->_link)) {
            return;
        }
        /* Keep original error. */
        $error = 'TLS not started: ' . @ldap_error($this->_link);
        $errno = @ldap_errno($this->_link);
        /* Test to see if the server supports TLS at all.
         * This is done via testing the extensions offered by the server.
         * The OID 1.3.6.1.4.1.1466.20037 tells whether TLS is supported. */
        try {
            $rootDSE = $this->rootDSE();
        } catch (Exception $e) {
            throw new Horde_Ldap_Exception('Unable to start TLS and unable to fetch rootDSE entry to see if TLS is supported: ' . $e->getMessage(), $e->getCode());
        }
        try {
            $supported_extensions = $rootDSE->getValue('supportedExtension');
        } catch (Exception $e) {
            throw new Horde_Ldap_Exception('Unable to start TLS and unable to fetch rootDSE attribute "supportedExtension" to see if TLS is supoported: ' . $e->getMessage(), $e->getCode());
        }
        if (!in_array('1.3.6.1.4.1.1466.20037', $supported_extensions)) {
            throw new Horde_Ldap_Exception('Server reports that it does not support TLS');
        }
        throw new Horde_Ldap_Exception($error, $errno);
    }