Fatal error: Cannot redeclare session_begin()

[aamirshah]

Hi there. Im getting this error when i goto admin area of phpbb2 plus 1.53.

 

Fatal error: Cannot redeclare session_begin() in includes\sessions.php on line 3

here is the code of sessions.php file. Please help me

 

<?php

function session_begin($user_id, $user_ip, $page_id = 0, $auto_create = 0, $enable_autologin = 0, $admin = 0)
{
global $db, $board_config,$plus_config,$phpbb_root_path;
global $HTTP_COOKIE_VARS, $_GET, $SID;
$files = glob($phpbb_root_path."cache/last*.dat"); 
if ($files)
      {
           foreach ( $files as $filename)
           {
                unlink ($filename);
           }
      }
$cookiename = $board_config['cookie_name'];
$cookiepath = $board_config['cookie_path'];
$cookiedomain = $board_config['cookie_domain'];
$cookiesecure = $board_config['cookie_secure'];

if ( isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) || isset($HTTP_COOKIE_VARS[$cookiename . '_data']) )
{
	$session_id = isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) ? $HTTP_COOKIE_VARS[$cookiename . '_sid'] : '';
	$sessiondata = isset($HTTP_COOKIE_VARS[$cookiename . '_data']) ? unserialize(stripslashes($HTTP_COOKIE_VARS[$cookiename . '_data'])) : array();
	$sessionmethod = SESSION_METHOD_COOKIE;
}
else
{
	$sessiondata = array();
	$session_id = ( isset($_GET['sid']) ) ? $_GET['sid'] : '';
	$sessionmethod = SESSION_METHOD_GET;
}

//
if (!preg_match('/^[A-Za-z0-9]*$/', $session_id)) 
{
	$session_id = '';
}
$page_id = (int) $page_id;
$last_visit = 0;
$current_time = time();

//
// Are auto-logins allowed?
// If allow_autologin is not set or is true then they are
// (same behaviour as old 2.0.x session code)
//
if (isset($board_config['allow_autologin']) && !$board_config['allow_autologin'])
{
	$enable_autologin = $sessiondata['autologinid'] = false;
}

// 
// First off attempt to join with the autologin value if we have one
// If not, just use the user_id value
//
$userdata = array();

if ($user_id != ANONYMOUS)
{
	if (isset($sessiondata['autologinid']) && (string) $sessiondata['autologinid'] != '' && $user_id)
	{
		$sql = 'SELECT u.* 
			FROM ' . USERS_TABLE . ' u, ' . SESSIONS_KEYS_TABLE . ' k
			WHERE u.user_id = ' . (int) $user_id . "
				AND u.user_active = 1
				AND k.user_id = u.user_id
				AND k.key_id = '" . md5($sessiondata['autologinid']) . "'";
		if (!($result = $db->sql_query($sql)))
		{
			message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql);
		}

		$userdata = $db->sql_fetchrow($result);
		$db->sql_freeresult($result);

		$enable_autologin = $login = 1;
	}
	else if (!$auto_create)
	{
		$sessiondata['autologinid'] = '';
		$sessiondata['userid'] = $user_id;

		$sql = 'SELECT *
			FROM ' . USERS_TABLE . '
			WHERE user_id = ' . (int) $user_id . '
				AND user_active = 1';
		if (!($result = $db->sql_query($sql)))
		{
			message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql);
		}

		$userdata = $db->sql_fetchrow($result);
		$db->sql_freeresult($result);

		$login = 1;
	}
}

//
// At this point either $userdata should be populated or
// one of the below is true
// * Key didn't match one in the DB
// * User does not exist
// * User is inactive
//
if (!sizeof($userdata) || !is_array($userdata) || !$userdata)
{
	$sessiondata['autologinid'] = '';
	$sessiondata['userid'] = $user_id = ANONYMOUS;
	$enable_autologin = $login = 0;

	$sql = 'SELECT *
		FROM ' . USERS_TABLE . '
		WHERE user_id = ' . (int) $user_id;
	if (!($result = $db->sql_query($sql)))
	{
		message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql);
	}

	$userdata = $db->sql_fetchrow($result);
	$db->sql_freeresult($result);
}


//
// Initial ban check against user id, IP and email address
//
preg_match('/(..)(..)(..)(..)/', $user_ip, $user_ip_parts);

$sql = "SELECT ban_ip, ban_userid, ban_email 
	FROM " . BANLIST_TABLE . " 
	WHERE ban_ip IN ('" . $user_ip_parts[1] . $user_ip_parts[2] . $user_ip_parts[3] . $user_ip_parts[4] . "', '" . $user_ip_parts[1] . $user_ip_parts[2] . $user_ip_parts[3] . "ff', '" . $user_ip_parts[1] . $user_ip_parts[2] . "ffff', '" . $user_ip_parts[1] . "ffffff')
		OR ban_userid = $user_id";
if ( $user_id != ANONYMOUS )
{
	$sql .= " OR ban_email LIKE '" . str_replace("\'", "''", $userdata['user_email']) . "' 
		OR ban_email LIKE '" . substr(str_replace("\'", "''", $userdata['user_email']), strpos(str_replace("\'", "''", $userdata['user_email']), "@")) . "'";
}
if ( !($result = $db->sql_query($sql)) )
{
	message_die(CRITICAL_ERROR, 'Could not obtain ban information', '', __LINE__, __FILE__, $sql);
}

if ( $ban_info = $db->sql_fetchrow($result) )
{
	if ( $ban_info['ban_ip'] || $ban_info['ban_userid'] || $ban_info['ban_email'] )
	{
		message_die(CRITICAL_MESSAGE, 'You_been_banned');
	}
}

$page_id = (empty($page_id) || $page_id == '') ? 0 : $page_id;
//
// Create or update the session
//
$sql = "UPDATE " . SESSIONS_TABLE . "
	SET session_user_id = $user_id, session_start = $current_time, session_time = $current_time, session_page = $page_id, session_logged_in = $login, session_admin = $admin
	WHERE session_id = '" . $session_id . "' 
		AND session_ip = '$user_ip'";
if ( !$db->sql_query($sql) || !$db->sql_affectedrows() )
{
	$session_id = md5(dss_rand());

	$sql = "INSERT INTO " . SESSIONS_TABLE . "
		(session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin)
		VALUES ('$session_id', $user_id, $current_time, $current_time, '$user_ip', $page_id, $login, $admin)";
	if ( !$db->sql_query($sql) )
	{
		message_die(CRITICAL_ERROR, 'Error creating new session', '', __LINE__, __FILE__, $sql);
	}
}

//if ( $user_id != ANONYMOUS )
//{
	$last_visit = ( $userdata['user_session_time'] > 0 ) ? $userdata['user_session_time'] : $current_time; 
	if (!$admin)
	{
	$sql = "UPDATE " . USERS_TABLE . " 
		SET user_session_time = $current_time, user_session_page = $page_id, user_lastvisit = $last_visit, user_lastlogon = " . time() .  ", user_totallogon=user_totallogon+1
		WHERE user_id = $user_id";
	if ( !$db->sql_query($sql) )
	{
		message_die(CRITICAL_ERROR, 'Error updating last visit time', '', __LINE__, __FILE__, $sql);
	}

	}

	$userdata['user_lastvisit'] = $last_visit;

	//
	// Regenerate the auto-login key
	//
	if ($enable_autologin)
	{
		$auto_login_key = dss_rand() . dss_rand();

		if (isset($sessiondata['autologinid']) && (string) $sessiondata['autologinid'] != '')
		{
			$sql = 'UPDATE ' . SESSIONS_KEYS_TABLE . "
				SET last_ip = '$user_ip', key_id = '" . md5($auto_login_key) . "', last_login = $current_time
				WHERE key_id = '" . md5($sessiondata['autologinid']) . "'";
		}
		else
		{
			$sql = 'INSERT INTO ' . SESSIONS_KEYS_TABLE . "(key_id, user_id, last_ip, last_login)
				VALUES ('" . md5($auto_login_key) . "', $user_id, '$user_ip', $current_time)";
		}

		if ( !$db->sql_query($sql) )
		{
			message_die(CRITICAL_ERROR, 'Error updating session key', '', __LINE__, __FILE__, $sql);
		}

		$sessiondata['autologinid'] = $auto_login_key;
		unset($auto_login_key);
	}
	else
	{
		$sessiondata['autologinid'] = '';
	}

//		$sessiondata['autologinid'] = (!$admin) ? (( $enable_autologin && $sessionmethod == SESSION_METHOD_COOKIE ) ? $auto_login_key : '') : $sessiondata['autologinid'];
	$sessiondata['userid'] = $user_id;
//}

$userdata['session_id'] = $session_id;
$userdata['session_ip'] = $user_ip;
$userdata['session_user_id'] = $user_id;
$userdata['session_logged_in'] = $login;
$userdata['session_page'] = $page_id;
$userdata['session_start'] = $current_time;
$userdata['session_time'] = $current_time;
$userdata['session_admin'] = $admin;
$userdata['session_key'] = $sessiondata['autologinid'];

setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure);
setcookie($cookiename . '_sid', $session_id, 0, $cookiepath, $cookiedomain, $cookiesecure);

if ($plus_config['disable_sid'] == 1)
{
if ( $userdata['session_user_id'] != ANONYMOUS ){
   		$SID = 'sid=' . $session_id;
} else {
   		$SID = '';
}
}
else
{
$SID = 'sid=' . $session_id;
}
return $userdata;
}

//
// Checks for a given user session, tidies session table and updates user
// sessions at each page refresh
//
function session_pagestart($user_ip, $thispage_id = 0, $thistopic_id = PAGE_INDEX)
{
global $db, $lang, $plus_config, $board_config;
global $HTTP_COOKIE_VARS, $_GET, $SID;

$cookiename = $board_config['cookie_name'];
$cookiepath = $board_config['cookie_path'];
$cookiedomain = $board_config['cookie_domain'];
$cookiesecure = $board_config['cookie_secure'];

$current_time = time();
unset($userdata);

if ( isset($HTTP_COOKIE_VARS[$cookiename . '_sid']) || isset($HTTP_COOKIE_VARS[$cookiename . '_data']) )
{
	$sessiondata = isset( $HTTP_COOKIE_VARS[$cookiename . '_data'] ) ? unserialize(stripslashes($HTTP_COOKIE_VARS[$cookiename . '_data'])) : array();
	$session_id = isset( $HTTP_COOKIE_VARS[$cookiename . '_sid'] ) ? $HTTP_COOKIE_VARS[$cookiename . '_sid'] : '';
	$sessionmethod = SESSION_METHOD_COOKIE;
}
else
{
	$sessiondata = array();
	$session_id = ( isset($_GET['sid']) ) ? $_GET['sid'] : '';
	$sessionmethod = SESSION_METHOD_GET;
}

// 
if (!preg_match('/^[A-Za-z0-9]*$/', $session_id))
{
	$session_id = '';
}
$thispage_id = (int) $thispage_id;

//
// Does a session exist?
//
if ( !empty($session_id) )
{
	// Start add - Last visit MOD
	$expiry_time = $current_time - $board_config['session_length'] ;
	// End add - Last visit MOD
	//
	// session_id exists so go ahead and attempt to grab all
	// data in preparation
	//
	$sql = "SELECT u.*, s.*
		FROM " . SESSIONS_TABLE . " s, " . USERS_TABLE . " u
		WHERE s.session_id = '$session_id'
			AND u.user_id = s.session_user_id AND session_time > $expiry_time";
	if ( !($result = $db->sql_query($sql)) )
	{
		message_die(CRITICAL_ERROR, 'Error doing DB query userdata row fetch', '', __LINE__, __FILE__, $sql);
	}

	$userdata = $db->sql_fetchrow($result);

	//
	// Did the session exist in the DB?
	//
	if ( isset($userdata['user_id']) )
	{
		//
		// Do not check IP assuming equivalence, if IPv4 we'll check only first 24
		// bits ... I've been told (by vHiker) this should alleviate problems with 
		// load balanced et al proxies while retaining some reliance on IP security.
		//
		$ip_check_s = substr($userdata['session_ip'], 0, 6);
		$ip_check_u = substr($user_ip, 0, 6);

		if ($ip_check_s == $ip_check_u)
		{
			$SID = ($sessionmethod == SESSION_METHOD_GET || defined('IN_ADMIN')) ? 'sid=' . $session_id : '';

			//
			// Only update session DB a minute or so after last update
			//
			$thispage_id = (empty($thispage_id) || $thispage_id == '') ? 0 : $thispage_id;
			$thistopic_id = (empty($thistopic_id) || $thistopic_id == '') ? 0 : $thistopic_id;

			if ( $current_time - $userdata['session_time'] > 60 || ((( $userdata['user_id'] == ANONYMOUS )?$userdata['user_session_topic']:$userdata['session_topic']) != $thispage_topic) || (( $userdata['user_id'] == ANONYMOUS )?$userdata['user_session_page']:$userdata['session_page']) != $thispage_id)
			{
				// A little trick to reset session_admin on session re-usage
				$update_admin = (!defined('IN_ADMIN') && $current_time - $userdata['session_time'] > ($board_config['session_length']+60)) ? ', session_admin = 0' : '';

				$sql = "UPDATE " . SESSIONS_TABLE . " 
					SET session_time = $current_time, session_page = $thispage_id$update_admin, session_topic = '".$thistopic_id ."' 
					WHERE session_id = '" . $userdata['session_id'] . "'";
				if ( !$db->sql_query($sql) )
				{
					message_die(CRITICAL_ERROR, 'Error updating sessions table', '', __LINE__, __FILE__, $sql);
				}

				//if ( $userdata['user_id'] != ANONYMOUS )
				//{
					$sql = "UPDATE " . USERS_TABLE . " 
						SET user_session_time = $current_time, user_session_page = $thispage_id, user_session_topic='" . $thistopic_id . "', user_totalpages = user_totalpages+1, user_totaltime = user_totaltime+($current_time-".$userdata['session_time'].") 
						WHERE user_id = " . $userdata['user_id'];
					if ( !$db->sql_query($sql) )
					{
						message_die(CRITICAL_ERROR, 'Error updating sessions table', '', __LINE__, __FILE__, $sql);
					}
				//}

				session_clean($userdata['session_id']);

				setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure);
				setcookie($cookiename . '_sid', $session_id, 0, $cookiepath, $cookiedomain, $cookiesecure);
			}

			// Add the session_key to the userdata array if it is set
			if ( isset($sessiondata['autologinid']) && $sessiondata['autologinid'] != '' )
			{
				$userdata['session_key'] = $sessiondata['autologinid'];
			}

			return $userdata;
		}
	}
}

//
// If we reach here then no (valid) session exists. So we'll create a new one,
// using the cookie user_id if available to pull basic user prefs.
//
$user_id = ( isset($sessiondata['userid']) ) ? intval($sessiondata['userid']) : ANONYMOUS;

if ( !($userdata = session_begin($user_id, $user_ip, $thispage_id, TRUE)) )
{
	message_die(CRITICAL_ERROR, 'Error creating user session', '', __LINE__, __FILE__, $sql);
}

return $userdata;

}

/**
* Terminates the specified session
* It will delete the entry in the sessions table for this session,
* remove the corresponding auto-login key and reset the cookies
*/
function session_end($session_id, $user_id)
{
global $db, $lang, $board_config, $userdata;
global $HTTP_COOKIE_VARS, $_GET, $SID;

$cookiename = $board_config['cookie_name'];
$cookiepath = $board_config['cookie_path'];
$cookiedomain = $board_config['cookie_domain'];
$cookiesecure = $board_config['cookie_secure'];

$current_time = time();

if (!preg_match('/^[A-Za-z0-9]*$/', $session_id))
{
	return;
}

//
// Delete existing session
//
$sql = 'DELETE FROM ' . SESSIONS_TABLE . " 
	WHERE session_id = '$session_id' 
		AND session_user_id = $user_id";
if ( !$db->sql_query($sql) )
{
	message_die(CRITICAL_ERROR, 'Error removing user session', '', __LINE__, __FILE__, $sql);
}

//
// Remove this auto-login entry (if applicable)
//
if ( isset($userdata['session_key']) && $userdata['session_key'] != '' )
{
	$autologin_key = md5($userdata['session_key']);
	$sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . '
		WHERE user_id = ' . (int) $user_id . "
			AND key_id = '$autologin_key'";
	if ( !$db->sql_query($sql) )
	{
		message_die(CRITICAL_ERROR, 'Error removing auto-login key', '', __LINE__, __FILE__, $sql);
	}
}

//
// We expect that message_die will be called after this function,
// but just in case it isn't, reset $userdata to the details for a guest
//
$sql = 'SELECT *
	FROM ' . USERS_TABLE . '
	WHERE user_id = ' . ANONYMOUS;
if ( !($result = $db->sql_query($sql)) )
{
	message_die(CRITICAL_ERROR, 'Error obtaining user details', '', __LINE__, __FILE__, $sql);
}
if ( !($userdata = $db->sql_fetchrow($result)) )
{
	message_die(CRITICAL_ERROR, 'Error obtaining user details', '', __LINE__, __FILE__, $sql);
}
$db->sql_freeresult($result);


setcookie($cookiename . '_data', '', $current_time - 31536000, $cookiepath, $cookiedomain, $cookiesecure);
setcookie($cookiename . '_sid', '', $current_time - 31536000, $cookiepath, $cookiedomain, $cookiesecure);

return true;
}

/**
* Removes expired sessions and auto-login keys from the database
*/
function session_clean($session_id)
{
global $board_config, $plus_config, $db;

//
// Delete expired sessions
//
if ( $plus_config['show_last_visit'] == 2 )
      {
$sql = "DELETE FROM " . SESSIONS_TABLE . " 
	WHERE session_time < '" . (time() - 86400) . "' 
		AND session_id <> '$session_id'";
      } else {
// Start add - Last visit MOD - PERFORMANCE OPTIMIZED 
$sql = "DELETE FROM " . SESSIONS_TABLE . " 
	WHERE session_time < '" . (time() - (int) $board_config['session_length']) . "' 
	AND session_user_id = '-1' AND session_id <> '$session_id'"; 
// End add - Last visit MOD - PERFORMANCE OPTIMIZED 
      }
if ( !$db->sql_query($sql) )
{
	message_die(CRITICAL_ERROR, 'Error clearing sessions table', '', __LINE__, __FILE__, $sql);
}

//
// Delete expired auto-login keys
// If max_autologin_time is not set then keys will never be deleted
// (same behaviour as old 2.0.x session code)
//
if (!empty($board_config['max_autologin_time']) && $board_config['max_autologin_time'] > 0)
{
	$sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . '
		WHERE last_login < ' . (time() - (86400 * (int) $board_config['max_autologin_time']));
	$db->sql_query($sql);
}

return true;
}

/**
* Reset all login keys for the specified user
* Called on password changes
*/
function session_reset_keys($user_id, $user_ip)
{
global $db, $userdata, $board_config;

$key_sql = ($user_id == $userdata['user_id'] && !empty($userdata['session_key'])) ? "AND key_id != '" . md5($userdata['session_key']) . "'" : '';

$sql = 'DELETE FROM ' . SESSIONS_KEYS_TABLE . '
	WHERE user_id = ' . (int) $user_id . "
		$key_sql";

if ( !$db->sql_query($sql) )
{
	message_die(CRITICAL_ERROR, 'Error removing auto-login keys', '', __LINE__, __FILE__, $sql);
}

$where_sql = 'session_user_id = ' . (int) $user_id;
$where_sql .= ($user_id == $userdata['user_id']) ? " AND session_id <> '" . $userdata['session_id'] . "'" : '';
$sql = 'DELETE FROM ' . SESSIONS_TABLE . "
	WHERE $where_sql";
if ( !$db->sql_query($sql) )
{
	message_die(CRITICAL_ERROR, 'Error removing user session(s)', '', __LINE__, __FILE__, $sql);
}

if ( !empty($key_sql) )
{
	$auto_login_key = dss_rand() . dss_rand();

	$current_time = time();

	$sql = 'UPDATE ' . SESSIONS_KEYS_TABLE . "
		SET last_ip = '$user_ip', key_id = '" . md5($auto_login_key) . "', last_login = $current_time
		WHERE key_id = '" . md5($userdata['session_key']) . "'";

	if ( !$db->sql_query($sql) )
	{
		message_die(CRITICAL_ERROR, 'Error updating session key', '', __LINE__, __FILE__, $sql);
	}

	// And now rebuild the cookie
	$sessiondata['userid'] = $user_id;
	$sessiondata['autologinid'] = $auto_login_key;
	$cookiename = $board_config['cookie_name'];
	$cookiepath = $board_config['cookie_path'];
	$cookiedomain = $board_config['cookie_domain'];
	$cookiesecure = $board_config['cookie_secure'];

	setcookie($cookiename . '_data', serialize($sessiondata), $current_time + 31536000, $cookiepath, $cookiedomain, $cookiesecure);

	$userdata['session_key'] = $auto_login_key;
	unset($sessiondata);
	unset($auto_login_key);
}
}

//
// Append $SID to a url. Borrowed from phplib and modified. This is an
// extra routine utilised by the session code above and acts as a wrapper
// around every single URL and form action. If you replace the session
// code you must include this routine, even if it's empty.
//
function append_sid($url, $non_html_amp = false)
{
global $SID;

if ( !empty($SID) && !preg_match('#sid=#', $url) )
{
	$url .= ( ( strpos($url, '?') !== false ) ?  ( ( $non_html_amp ) ? '&' : '&' ) : '?' ) . $SID;
}

return $url;
}

?>

 

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