Which symbol is used to declare nested namespaces?

Which one of the following is the correct way of declaring a namespace?

Which of the following can you place inside a namespace?

Which function effectively deletes all sessions that have expired?

Which function is used to transform PHP’s session-handler behavior into that defined by your custom handler?

The session_start() function must appear..

Before you can start processing images with PHP, you must first add the ability to upload images to your administrative form on ___.

A package is a set of related ___.

Till which version of PHP, developers were forced to name their files in a global context?

Which method is invoked when an undefined property is accessed ?