The current code path may trigger situations where the LDAP application is not yet loaded and thus problems with the authentication appeared.

In previous versions of ownCloud the authentication mechanism manually loaded these apps which is why this affects ownCloud 8 and master only for my knowledge. (certainly not 6, maybe 7)

Backport to 8 might be something to consider.

Fixes https://github.com/owncloud/core/issues/14469

Apparently a boolean in php.ini is according to the documentation "on" or "off"…

Fixes itself.

This allows to check for specific values in the PHP.ini that ownCloud requires for full compatibility.

`mbstring.func_overload`: https://github.com/owncloud/core/issues/14372
`output_buffering`: http://doc.owncloud.org/server/8.0/admin_manual/configuration/big_file_upload_configuration.html#configuring-php

Fixes https://github.com/owncloud/core/issues/14372 and https://github.com/owncloud/core/issues/14412

on ownCloud upgrade: upgrade all apps in order, load important ones

Fix "other" app update stack

Fixes https://github.com/owncloud/core/issues/14356

This prevents a misusage of \OC\Files\View by calling it with user-supplied input. In such cases an exception is now thrown.

Somehow they got messed up. Because PHP does automatic type juggling this has worked before as well however it's not guaranteed that this might work in the future as well.

Due to a security hardening in 8.1 a missing value of empty trusted domains in the config would provoke an error as this was misused by a lot of users.

This caused a problem where the initial installation happened from another domain than 127.0.0.1 as in this case the domain was considered untrusted as no value was defined. However, this special case should not get intercepted.

To test:
- [ ] Installing ownCloud on 127.0.0.1 works
- [ ] Installing ownCloud on another domain / IP works
- [ ] When setting up ownCloud from 127.0.0.1 and accessing it from the domain above the trusted domain error should be shown if not specified in the config

Fixes https://github.com/owncloud/core/issues/14320

APCu before 4.0.6 is unbelievable buggy and tend to segfault the PHP process (i.e. the whole webserver)

This potentially fixes https://github.com/owncloud/core/issues/14175

Requires a backport to stable8

It still works otherwise, but without this, the performance optimization
of #13416 is defeated in these situations.

Fixes: #14048, #14104, calendar#712