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9.	How would you acquire a Unix timestamp representing the current date and time?
	The time() function returns the current date in timestamp format.
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10.	How would you end a session and erase all traces of it for future visits?
	The session_destroy() function removes all traces of a session for future requests.
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11.	Can you include a function call within a string, as you can with a variable?
	No. You must call functions outside quotation marks.
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12.	Which $_SERVER array element could you use to determine the IP address of a user?
	The $_SERVER['REMOTE_ADDR'] element should store the user’s IP address.
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