Adldap\Auth\Guard::bind PHP Method

    public function bind($username, $password, $prefix = null, $suffix = null)
    {
        // We'll allow binding with a null username and password
        // if their empty. This will allow us to anonymously
        // bind to our servers if needed.
        $username = $username ?: null;
        $password = $password ?: null;
        if ($username) {
            // If the username isn't empty, we'll append the configured
            // account prefix and suffix to bind to the LDAP server.
            $prefix = $prefix ?: $this->configuration->get('account_prefix');
            $suffix = $suffix ?: $this->configuration->get('account_suffix');
            $username = $prefix . $username . $suffix;
        }
        // We'll mute any exceptions / warnings here. All we need to know
        // is if binding failed and we'll throw our own exception.
        if (!@$this->connection->bind($username, $password)) {
            throw new BindException($this->connection->getLastError(), $this->connection->errNo());
        }
    }