PHP - Deprecated: Function eregi() is deprecated in

Пример ошибки

Deprecated: Function eregi() is deprecated in /home/user1/domains/domain/public_html/modules/mod_swmenupro/functions.php on line 2645 
Deprecated: Function eregi() is deprecated in /home/user1/domains/domain/public_html/modules/mod_swmenupro/functions.php on line 2657 

или

Deprecated: Function ereg() is deprecated in /home/user2/domains/domain/public_html/pages/account/_payment.php on line 93
Deprecated: Function ereg() is deprecated in /home/user2/domains/domain/public_html/classes/_class.func.php on line 124
Unknown column 'valuta' in 'field list'

может возникнуть при переходе с php 5.2.17 до 5.3.x

Решение - откатится до php 5.2.17 или переписать код под 5.3.x