Resolved: /includes/functions.php common.php: 1

[dr_gori]

When migrating the server site, it started to give the following message:

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[phpBB Debug] PHP Warning: in file /includes/functions.php on line 4608: Cannot modify header information - headers already sent by (output started at /language/en/common.php:1) 
[phpBB Debug] PHP Warning: in file /includes/functions.php on line 4610: Cannot modify header information - headers already sent by (output started at /language/en/common.php:1) 
[phpBB Debug] PHP Warning: in file /includes/functions.php on line 4611: Cannot modify header information - headers already sent by (output started at /language/en/common.php:1) 
[phpBB Debug] PHP Warning: in file /includes/functions.php on line 4612: Cannot modify header information - headers already sent by (output started at /language/en/common.php:1) 
Last visit was: 10 Nov 2014 02:45 pm 

After searching, I discovered that it had an invisible character in this file!
had a b.o.m. (Byte Order Mark). https://www.phpbb.com/support/docs/en/3 ... thout-bom/
Then, to remove, I managed using Linux's own VI:

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 :setlocal nobomb  
:w