define overridable constants for session properties FS#1913

inc/init.php

@@ -140,18 +140,23 @@ if ($conf['gzip_output'] &&
 }
 
 // init session
-if (!headers_sent() && !defined('NOSESSION')){
-    session_name("DokuWiki");
+if(!headers_sent() && !defined('NOSESSION')) {
+    if(!defined('DOKU_SESSION_NAME'))     define ('DOKU_SESSION_NAME', "DokuWiki");
+    if(!defined('DOKU_SESSION_LIFETIME')) define ('DOKU_SESSION_LIFETIME', 0);
     $cookieDir = empty($conf['cookiedir']) ? DOKU_REL : $conf['cookiedir'];
-    if (version_compare(PHP_VERSION, '5.2.0', '>')) {
-        session_set_cookie_params(0,$cookieDir,'',($conf['securecookie'] && is_ssl()),true);
-    }else{
-        session_set_cookie_params(0,$cookieDir,'',($conf['securecookie'] && is_ssl()));
+    if(!defined('DOKU_SESSION_PATH'))     define ('DOKU_SESSION_PATH', $cookieDir);
+    if(!defined('DOKU_SESSION_DOMAIN'))   define ('DOKU_SESSION_DOMAIN', '');
+
+    session_name(DOKU_SESSION_NAME);
+    if(version_compare(PHP_VERSION, '5.2.0', '>')) {
+        session_set_cookie_params(DOKU_SESSION_LIFETIME, DOKU_SESSION_PATH, DOKU_SESSION_DOMAIN, ($conf['securecookie'] && is_ssl()), true);
+    } else {
+        session_set_cookie_params(DOKU_SESSION_LIFETIME, DOKU_SESSION_PATH, DOKU_SESSION_DOMAIN, ($conf['securecookie'] && is_ssl()));
     }
     session_start();
 
     // load left over messages
-    if(isset($_SESSION[DOKU_COOKIE]['msg'])){
+    if(isset($_SESSION[DOKU_COOKIE]['msg'])) {
         $MSG = $_SESSION[DOKU_COOKIE]['msg'];
         unset($_SESSION[DOKU_COOKIE]['msg']);
     }