Using a session_handler like this one:
http://gateway.digitaria.com/~chris/php/mysql_session_handler/mysql_session_handler.phps

Using a mySQL-database.

Have the following configure './configure' '--with-mysql' '--with-apache=../apache_1.3.20'
'--enable-track-vars' '--enable-trans-sid' '--enable-ftp' '-disable-debug'

The problem: I have noticed that if you use set_session_save_handler with mysql and you
don?t accept cookies and there is a broken image on the page, PHP generates to many sessions:
This is an example code that generates this error (named test.php3):

<?php
 mysql_connect ("localhost", "user", "pass");
  include("the session file like the one linked above");
  session_start();
?>
  <img src="fdsafdsaf.jpg">
<?php
   // count the number of sessions stored in the database
    $numsessions = mysql_num_rows(mysql_query("select * from sessions"));
    echo $ numsessions;
?>
<br>
<a href="test.php3">test</a>


Notice how the number of sessions are added, but you still have your same session id. What
happens is that PHP generates a number of session ids, that are never used. This problem
doesn?t occur if you have cookies enabled, or don?t uses set_session_save_handler.

I have also noticed that the image doesn't need to be broken, It can also be a gif and only contain a transparent colour. This generates the same error.

I found what the problem was. When there is a broken image on the page, the 404-page was loaded. On that page sessions were loaded again, causing the error.