Re: Search Engines and Sessions(Cross Posted to comp.lang.php)

I just had an idea. session_start(); // Start Sessions if(isset($_SESSION['fname']) != true){ session_destroy(); } It works until I login. Then I get this error(When cookies is on): Warning: Trying to destroy uninitialized session in C:\Inetpub\CO2 Busters MK2\includes\required.php on line 35 Warning: Cannot send session cookie - headers already sent by (output started at C:\Inetpub\CO2 Busters MK2\includes\article.func.php:148) in C:\Inetpub\CO2 Busters MK2\includes\session.func.php on line 13 Warning: Cannot send session cache limiter - headers already sent (output started at C:\Inetpub\CO2 Busters MK2\includes\article.func.php:148) in C:\Inetpub\CO2 Busters MK2\includes\session.func.php on line 13 Or this error(When cookies are off): Warning: Cannot send session cookie - headers already sent by (output started at C:\Inetpub\CO2 Busters MK2\includes\article.func.php:148) in C:\Inetpub\CO2 Busters MK2\includes\session.func.php on line 22 Warning: Constant sid already defined in C:\Inetpub\CO2 Busters MK2\includes\session.func.php on line 22 Warning: Cannot send session cache limiter - headers already sent (output started at C:\Inetpub\CO2 Busters MK2\includes\article.func.php:148) in C:\Inetpub\CO2 Busters MK2\includes\session.func.php on line 22 Here is the session.func.php file: <? function welcome_or_login(){ if(isset($_SESSION['fname'])){ echo 'Hello '.$_SESSION['fname'].'.'; } else { do_h('Login', 3, 'y'); do_hr(); login_form(''); } } function register_in_session($uid, $gid, $banid, $username, $fname, $lname, $email){ // Used in conjuction with validate() to input user info into the session session_register('uid'); session_register('gid'); session_register('banid'); session_register('username'); session_register('fname'); session_register('lname'); session_register('email'); } ?> when I do a var_dump($_SESSION) on the logon page(after logging in) I get array(0) { } when I do the same thing on any other page I get this: array(7) { ["uid"]=> &string(1) "1" ["gid"]=> &string(1) "1" ["banid"]=> &string(1) "0" ["username"]=> &string(6) "Lizner" ["fname"]=> &string(2) "JJ" ["lname"]=> &string(8) "Harrison" ["email"]=> &string(24) "webmaster@co2busters.org" } How can I fix it? or isn't it possible? -- JJ Harrison webmaster@tececo.com www.tececo.com Once I leave the login page the sessions work fine(I did a var dump "Richard Lynch" <rich@phpbootcamp.com> wrote in message news:php.general-108706@news.php.net... > >I am worried about search engines and sessions. > > > >If the UA doesn't support cookies the session id is passed through the urls. > > > >Search engines won't spider pages with a ? in the url because > >page.php?sid=bdf4f91bcc71443cd251a7d3eed05c9c and > >page.php?sid=5a547f86ea14186942d0305e352d9e41 would be considered different > >pages(The search engines robot could go into a continuos loop). > > > >I only use sessions on all pages but they do nothing if the user hasn't > >signed in. > > > >what would be a good way to not start the session id in the url if the > >person had not logged in anyway? The problem is that if you haven't started > >a session you can't check for session variables. > > You have several options: > > 1. Use robots.txt (Google for Robot Guidelines) to "force" the search > engines to specific URLs you want indexed. > > 2. Attempt to "detect" the major search engines, and give them a sessionless > link. Not recommended. They may think you're trying to hide a porn site > from them. > > 3. "Hide" the ? from the search engines, by simply not using ? in your URL. > Use / instead, and then your GET data won't be in $_GET, but it will be in > $PATH_INFO and $REQUEST_URI (see <?php phpinfo();?>. It will also mess up > $PHP_SELF, but it's a small price to pay. :-) > php.php/sid/bdf4f91bcc71443cd251a7d3eed05c9c > > While these will be "different" pages to the search engines, you should be > propagating the session ID for the entire search -- IE< the spider will get > its own SID, and will keep re-presenting it in the links it continues to > traverse. Although, if you time out your sessions faster than the spider > travels, you'll lose them. > > There are probably more ways to skin this cat. > > -- > Like Music? http://l-i-e.com/artists.htm >