From looking at the documentation, I see:

• atime() - Read-only method. Returns the last access time of the session in seconds from epoch. This time is used internally while auto-expiring sessions and/or session parameters.
• ctime() - Read-only method. Returns the time when the session was first created in seconds from epoch.
• expire() - Sets expiration interval relative to atime().

So, expire() seems to look at atime(), at least when in "auto-expire" mode. I don't know what that is, but seeing that you've hidden your relevant code quite well, I guess that you're not using "auto-expire" mode or that your description of what you see does not correlate with what happens.

Why would you expect ctime() ever to change for one session?

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.