phpBB Debug] PHP Notice: in file /includes/session.php on line 542: Undefined index: k
[phpBB Debug] PHP Notice: in file /includes/session.php on line 713: Cannot modify header information - headers already sent by (output started at /home/linkweb/public_html/forums/includes/functions.php:2232)
[phpBB Debug] PHP Notice: in file /includes/session.php on line 713: Cannot modify header information - headers already sent by (output started at /home/linkweb/public_html/forums/includes/functions.php:2232)
[phpBB Debug] PHP Notice: in file /includes/session.php on line 713: Cannot modify header information - headers already sent by (output started at /home/linkweb/public_html/forums/includes/functions.php:2232)
[phpBB Debug] PHP Notice: in file /includes/session.php on line 297: Invalid argument supplied for foreach()
[phpBB Debug] PHP Notice: in file /includes/session.php on line 713: Cannot modify header information - headers already sent by (output started at /home/linkweb/public_html/forums/includes/functions.php:2232)
[phpBB Debug] PHP Notice: in file /includes/session.php on line 713: Cannot modify header information - headers already sent by (output started at /home/linkweb/public_html/forums/includes/functions.php:2232)
[phpBB Debug] PHP Notice: in file /includes/session.php on line 713: Cannot modify header information - headers already sent by (output started at /home/linkweb/public_html/forums/includes/functions.php:2232)

My Quick Solutions:
includes/session.php

[u]if (is_array($active_bots))[/u] foreach ($active_bots as $row)

Why i put as ACM ?
Based on phpBB3-CVS_2006-05-16
includes/acm/acm_main.php:258

function obtain_bots(&$bots)

	{

		if (!([b]$bots = $this->get('bots')[/b]))

		...

	}

and
includes/acm/acm_file.php:127

function get($var_name)

	{

		if ($var_name{0} == '_')

		{

		    ...

		}

		else

		{

			return ($this->_exists($var_name)) ? $this->vars[$var_name] : [b]false[/b];

		}

	}

Thanks