From https://github.com/owncloud/core/issues/16287:
> This is caused by XCache at 8e59d4c64b/lib/private/util.php (L1276) where we are trying to reset the opcode cache with `XC_TYPE_PHP`.
> I suspect that while XCache is installed its opcode component is not used. Unfortunately, the XCache API is not really properly documented and thus I don't know what API we would have to call to check whether the `XC_TYPE_PHP` cache is populated. In fact, there is an [open XCache bug](http://xcache.lighttpd.net/ticket/176) since 7 years that discusses this problem and is likely to never get fixed since XCache is abandonware.
Fixes https://github.com/owncloud/core/issues/16287
This removes the hard-dependency on output buffering as requested at https://github.com/owncloud/core/issues/16013 since a lot of distributions such as Debian and Ubuntu decided to use `4096` instead of the PHP recommended and documented default value of `off`.
However, we still should encourage disabling this setting for improved performance and reliability thus the setting switches in `.user.ini` and `.htaccess` are remaining there. It is very likely that we in other cases also should disable the output buffering but aren't doing it everywhere and thus causing memory problems.
Fixes https://github.com/owncloud/core/issues/16013
Nobody reads the warnings anyways and so we should enforce it at installation time... Also allows us to get rid of some duplicated code.
To test change the `default_charset` to something other than `utf-8` or `UTF-8`, both should work fine with that change here. An error should then get shown.
We already set those default charsets in the shipped .user.ini and .htaccess
This changeset removes the static class `OC_Request` and moves the functions either into `IRequest` which is accessible via `\OC::$server::->getRequest()` or into a separated `TrustedDomainHelper` class for some helper methods which should not be publicly exposed.
This changes only internal methods and nothing on the public API. Some public functions in `util.php` have been deprecated though in favour of the new non-static functions.
Unfortunately some part of this code uses things like `__DIR__` and thus is not completely unit-testable. Where tests where possible they ahve been added though.
Fixes https://github.com/owncloud/core/issues/13976 which was requested in https://github.com/owncloud/core/pull/13973#issuecomment-73492969
HHVM seems to have problems with this at the moment (even setting those values in the php.ini of HHVM doesn't have helped much) and thus the unit test execution failed.
So it's better if we disable this check for now for HHVM.
