private function checkNow(string $storeVarName) : bool
    {
        $now = $this->microtimeFloat();
        $this->{$storeVarName} = $now;
        return true;
    }
private function checkNow(string $storeVarName) : bool
    {
        $now = $this->microtimeFloat();
        $this->{$storeVarName} = $now;
        return true;
    }
private function checkNow ( string $ storeVarName ) : bool { $ now = $ this -> microtimeFloat ( ) ; $ this -> { $ storeVarName } = $ now ; return true ; }
to set the current micro time.

@param string $storeVarName
@return bool
to set the current micro time .