Calling render() multiple times on Calendar duplicates Timezone

[thexeos]

In example5.php, calling $vCalendar->render() one more time produces duplicate BEGIN:VTIMEZONE in the output. Additional calls will each add a duplicate VTIMEZONE to the file.

Why it happens: when properties are joined in Calendar->buildPropertyBag, the Timezone is added as a child component with every invocation.

My use case was logging the output of render() independent from the function that prints out the calendar for the client. For now I use a variable to keep the render for logging.