From 7a14286feddcb14d3b49d2d7c83b776285946fb4 Mon Sep 17 00:00:00 2001
From: Christopher Guiney <chris@guiney.net>
Date: Fri, 29 Jun 2012 20:34:28 -0700
Subject: Respect php.ini's values for calculating the probability of a session
 gc

---
 application/config/config.php |  2 --
 system/libraries/Session.php  | 13 +++++--------
 2 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/application/config/config.php b/application/config/config.php
index e3f87eb42..726e3a71c 100644
--- a/application/config/config.php
+++ b/application/config/config.php
@@ -276,7 +276,6 @@ $config['encryption_key'] = '';
 | 'sess_match_ip'			= Whether to match the user's IP address when reading the session data
 | 'sess_match_useragent'	= Whether to match the User Agent when reading the session data
 | 'sess_time_to_update'		= how many seconds between CI refreshing Session Information
-| 'gc_probability'			= percent chance that stale sessions to be deleted
 |
 */
 $config['sess_cookie_name']		= 'ci_session';
@@ -288,7 +287,6 @@ $config['sess_table_name']		= 'ci_sessions';
 $config['sess_match_ip']		= FALSE;
 $config['sess_match_useragent']	= TRUE;
 $config['sess_time_to_update']	= 300;
-$config['gc_probability']		= 5;
 
 /*
 |--------------------------------------------------------------------------
diff --git a/system/libraries/Session.php b/system/libraries/Session.php
index 4e5e256a1..af38dc366 100644
--- a/system/libraries/Session.php
+++ b/system/libraries/Session.php
@@ -155,12 +155,6 @@ class CI_Session {
 	 */
 	public $time_reference			= 'local';
 
-	/**
-	 * Probablity level of garbage collection of old sessions
-	 *
-	 * @var int
-	 */
-	public $gc_probability			= 5;
 
 	/**
 	 * Session data
@@ -201,7 +195,7 @@ class CI_Session {
 
 		// Set all the session preferences, which can either be set
 		// manually via the $params array above or via the config file
-		foreach (array('sess_encrypt_cookie', 'sess_use_database', 'sess_table_name', 'sess_expiration', 'sess_expire_on_close', 'sess_match_ip', 'sess_match_useragent', 'sess_cookie_name', 'cookie_path', 'cookie_domain', 'cookie_secure', 'cookie_httponly', 'sess_time_to_update', 'time_reference', 'cookie_prefix', 'encryption_key', 'gc_probability') as $key)
+		foreach (array('sess_encrypt_cookie', 'sess_use_database', 'sess_table_name', 'sess_expiration', 'sess_expire_on_close', 'sess_match_ip', 'sess_match_useragent', 'sess_cookie_name', 'cookie_path', 'cookie_domain', 'cookie_secure', 'cookie_httponly', 'sess_time_to_update', 'time_reference', 'cookie_prefix', 'encryption_key') as $key)
 		{
 			$this->$key = isset($params[$key]) ? $params[$key] : $this->CI->config->item($key);
 		}
@@ -940,8 +934,11 @@ class CI_Session {
 			return;
 		}
 
+		$probability = ini_get('session.gc_probability');
+		$divisor = ini_get('session.gc_divisor');
+
 		srand(time());
-		if ((rand() % 100) < $this->gc_probability)
+		if ((mt_rand(0, $divisor) / $divisor) < $probability)
 		{
 			$expire = $this->now - $this->sess_expiration;
 
-- 
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