Not sure where to start?

[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 113: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 113: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 5312: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3925)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 5312: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3925)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 5312: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3925)
Not sure where to start? - Homeschool World Forum