PHPSESSID appended completely wrong with session.use_trans_sid enabled

Hi, it seems to me that I've hit a bug related to the session.use_trans_sid feature when output buffering (output_buffer) is on and configured to be less than the content-size sent to the browser. A self-made template system produces a php script as a string which gets then eval'd. The produced script contains many 'echo' directives and if-statements that evaluate conditions fed by the template system. It is sometimes necessary to conditionally output parameters in an url of a link (html anchor). So, instead of echo'ing the whole link at once it gets written to the output with 'echo' 3 or more times. E.g. <code> echo '<a href="editfilingcard.m-box?action=modify&amp;fcardid=3067'; // some condition from the template system was evaluated // to be true if (true) echo '&amp;belongs2fcard=1411'; echo '&amp;setmgrname=mboxobj">link text</a> </code> Now, it happens sometimes that the session ID is appended completely wrong after the quote closing the 'href' attribute but before the tag-closing '>': <a href="editfilingcard.m-box?action=modify&amp;fcardid=3067&amp;belongs2fcard=1411&amp;setmgrname=mboxobj"?PHPSESSID=f0hriua92m1oe6hmn47upm8n34> Interestingly, links before or after the one mentioned here aren't affected in my scenario. Also, removing enough characters from the output before the link, everything works fine; and if I increase the output buffer from the default (4096) to 8192 (which is more than the content-size in my scenario) everything is fine, too. I assume, due to my tests, that output buffering somehow interferes badly with automatically inserting the session ID. I'm using php-5.2.10 on windows together with apache and IIS. Any help is welcome, I can provide a script reproducing the problem. Klaus Triendl