<?php
	session_start( );
	$sess = $_SESSION[ 'phpgw_session' ];
    $connection_id = "{$sess['session_id']}{$sess['session_ip']}".substr($_SERVER[ 'HTTP_USER_AGENT' ],0,199);
 
	if ( empty($_SESSION['phpgw_session']['session_id']) ||
		($_SESSION['connection_db_info']['user_auth'] && implode('',$_SESSION['connection_db_info']['user_auth']) !== $connection_id)
	)
	{
		if($_SESSION['connection_db_info']['user_auth'] && !strstr($_SERVER['SCRIPT_URL'],"/controller.php"))
			error_log( '[ INVALID SESSION ] >>>>' . implode('',$_SESSION['connection_db_info']['user_auth']) . '<<<< - >>>>' . $connection_id . '<<<<', 0 );

		setcookie("PHPSESSID","",0);
		setcookie ("sessionid","",0);	
		unset($_SESSION);
		// From ExpressoAjax response "nosession"
		if(strstr($_SERVER['SCRIPT_URL'],"/controller.php")){
			echo serialize(array("nosession" => true));
			exit;
		}
	}
	else{
		// Keep Alive session user.
		if ( isset( $_COOKIE[ 'sessionid' ] ) )
			session_id( $_COOKIE[ 'sessionid' ] );
		// From ExpressoAjax update session_dla (datetime last access). 
		if(strstr($_SERVER['SCRIPT_URL'],"/controller.php"))
			$_SESSION['phpgw_session']['session_dla'] = time();
	}
?>