public function saslBind(
        $bindDn = null,
        $bindPassword = null,
        $saslMech = null,
        $saslRealm = null,
        $saslAuthcId = null,
        $saslAuthzId = null,
        $props = null
    ) {
        @ldap_sasl_bind(
            $this->resource,
            $bindDn,
            $bindPassword,
            $saslMech,
            $saslRealm,
            $saslAuthcId,
            $saslAuthzId,
            $props
        );
        $this->verifyOperation();

        return $this;
    }