As first reported by gcan2 here: https://sourceforge.net/projects/phpmyadmin/forums/forum/72909/topic/3762139
PHP 5.3 depreceates the ereg() function which PMA seems to use in db_structure.php.
http://php.net/manual/en/migration53.deprecated.php
http://www.php.net/manual/en/function.ereg.php
The PHP documentation suggest using preg_match() instead.
This bug was fixed in repository and will be part of a future release; thanks for reporting.