A8 logo looks fine?

and i do not think it's DOS attack, it should have been pretty much denying service as the name suggests but it's denial of service it's like file acess error.

I mean apache is not denying to show you a page / get your connection, you can connect fine even the php script runs and returns the error and sometimes runs without the error and show the page.

But the error is strange of course, ini_set should always be defined in php, it's a predefined php function. To me it looks either like there is an error in php.ini or apache/php setup and settings.