[PHP-INSTALL] Strange error with PHP 4.3.8

Hello List,

I am using PHP 4.3.8 in a Sun Unix environment. I encounter a strange error: 
When I logged into an app based on this PHP version it redirects me to the 
original login dialogue after a successful login (using session ids).
I have traced down the error cause to the follwing line:

  ini_set("session.use_cookies",0);

The strangest thing is, that I have put all session commands in one include 
file which is included in virtually every file of the app. Only the file 
which contains the frameset-definitions fails on this line. If I comment it 
out, everything works ok.
The same line is present in the first file which the user calls where all 
the login verification is done. There I cannot observe any failure.
I have tried the above command with the zero in quotation marks, but that 
isn't the cause. A research with Google on issues of PHP 4.3.8 with this 
command or with "use_cookies" revealed nothing. Version 4.3.6 shows no 
problems.
Below the full code of the included file and the first lines of the first 
file which handles the login.
Thanks for your help,
Jonathan.

----------------- included file for session handling 
------------------------
  ini_set("session.use_cookies",0);                     // Deactivate 
cookie session function
  session_name("TRS_Session");                          // Define session 
name
  session_start();                                      // Initialize 
session
  import_request_variables ("PG","form_");

  if ( !session_is_registered('sess_status') ) {
     header("location: trs.php");
     exit;
  }


-------------------- first file to login 
-----------------------------------------
  ini_set("session.use_cookies",0);                     // Deactivate 
cookie session fuction
  session_name("TRS_Session");                          // Define session 
name
  session_start();                                      // Initialize 
session
  // Compatibility patch for < PHP 4.2:
  if (function_exists ("import_request_variables")) {
     import_request_variables ("PG","form_");
  }

  if ( $_SESSION["sess_status"] == true ) {             // If login has 
already been successful:
     header('location:index.php?'.SID);                 // go directly to 
index.php, no login !!MUST pass SID to page!!!
     exit;
  }
....

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