День добрый! Подскажите что делать? При переходе с php5.6 на php 7.0 в шапке форума, в самом верху, появляются такие предупреждения.
▼Spoiler
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP;
DBLayer has a deprecated constructor in /public_html/forum/include/dblayer/mysqli.php on line 16
Warning: session_cache_limiter(): Cannot change cache limiter when headers already sent in /public_html/forum/include/functions.php on line 47
Warning: session_start(): Cannot start session when headers already sent in /public_html/forum/include/functions.php on line 63
Warning: session_regenerate_id(): Cannot regenerate session id - session is not active in /public_html/forum/include/functions.php on line 66
Warning: Cannot modify header information - headers already sent by (output started at /public_html/forum/include/dblayer/mysqli.php:16) in /public_html/forum/include/functions.php on line 215
Warning: Cannot modify header information - headers already sent by (output started at /public_html/forum/include/dblayer/mysqli.php:16) in /public_html/forum/include/functions.php on line 218
Warning: Cannot modify header information - headers already sent by (output started at /public_html/forum/include/dblayer/mysqli.php:16) in /public_html/forum/header.php on line 16
Warning: Cannot modify header information - headers already sent by (output started at /public_html/forum/include/dblayer/mysqli.php:16) in /public_html/forum/header.php on line 17
Warning: Cannot modify header information - headers already sent by (output started at /public_html/forum/include/dblayer/mysqli.php:16) in /public_html/forum/header.php on line 18
Warning: Cannot modify header information - headers already sent by (output started at /public_html/forum/include/dblayer/mysqli.php:16) in /public_html/forum/header.php on line 19
Warning: Cannot modify header information - headers already sent by (output started at /public_html/forum/include/dblayer/mysqli.php:16) in /public_html/forum/header.php on line 22
Так понимаю, что ошибки в файлах mysqli.php, include/functions.php, forum/header.php?
Приложил их в архиве. Помогите, пожалуйста 
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