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There is an optional N argument to this directive that determines the number of directory levels your session files will be spread around in. For example, setting to '5;/tmp' may end up creating a session file and location like /tmp/4/b/1/e/3/sess_4b1e384ad74619bd212e236e52a5a174If . In order to use N you must create all of these directories before use.

<?php

   $path =  _get_session_save_path();
   $path = $path . '/0/0';
   echo $path.'<br/>';
   echo  "'$path' " .  ((is_dir($path))?'does':'does NOT' ) . ' exist <br>';
  echo  "'$path' " .  ((is_writable($path))?'is':'is NOT' ) . ' writable <br>';

   function _get_session_save_path()
    {
        $path = ini_get('session.save_path');
        if( ($pos = strpos($path,';')) !== FALSE) $path = substr($path,$pos+1);

        if( $path ) return $path;
    }

$path . '/0/0';

In order to use N you must create all of these directories before use. A small shell script exists in ext/session to do this, it's called mod_files.sh, with a Windows version called mod_files.bat