1. If your script sends a session id, everyone who visit the script would get a session id.

Answers are reversed to make it a little easier.

3. Usually the session id is sent throgh the answer http header as a cookie. It is designed to be a 32 byte random number, that makes a hijack of someone elses session more difficult. Then when a user progresser through the site the user sends back the 32 byte number to mark a valid session. So when the script receives a sessionnumber it should not send a new sessioncookie. The received cookie is set up to compare to sessiondata stored on the server usually in a tmp-file.

2. The session file should just hold a user_id, so if the session-tmp-file exists on a particular session the user_id could be retrieved through the file.

Also if you don't want to have a sessionfile you could hold the session information in the db.

In reply to Re: question on program flow and checking for cgi-session by JanneVee
in thread question on program flow and checking for cgi-session by cranberry13

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • 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! —
  • 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:
    & &amp;
    < &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.