fix OS checks. fixes #4446 and #4445

Access to /etc might be restricted. We simply ignore the errors and
pretend the file does not exist.

Strictly speaking, the files are not in ini format. But par

fix OS checks. fixes #4446 and #4445

Access to /etc might be restricted. We simply ignore the errors and
pretend the file does not exist.

Strictly speaking, the files are not in ini format. But parsing them as
ini mostly works, except for some comments (on synology), so we strip
the comments first.

This also makes sure the correct file is read on synology.

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�� Rector and PHPCS fixes

Output more version data on the admin screen

Bug reports are often lacking crucial information about the environment
the wiki is run on and novice users often do not know how to obtain this
data.

T

Output more version data on the admin screen

Bug reports are often lacking crucial information about the environment
the wiki is run on and novice users often do not know how to obtain this
data.

This patch gathers some environmental information and outputs it next to
the DokuWiki version number on the admin screen.

Info included (if obtainable):

* PHP version
* Linux Distribution name and version
* Operating System and Version (refers to kernel version on linux)
* The PHP SAPI (modphp, cgi, fcgi)
* If running on kubernetes or docker

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Merge pull request #4069 from dokuwiki/debugbacktrace

Fix Undefined array key "file" and "line"

Reworked API definition

This cleans up the API:

* no more compatibility with obsolete wiki API
* no more difference between wiki.* and dokuwiki.* calls -> core.*
* use of optional parameters avoids

Reworked API definition

This cleans up the API:

* no more compatibility with obsolete wiki API
* no more difference between wiki.* and dokuwiki.* calls -> core.*
* use of optional parameters avoids double definitions
* use Response objects for complex results
* always use named primitives as input
* major cleanup of docblock descriptions

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improved API docs

clean up dbg_backtrace

This makes the formatting decisions more explicit instead of multiple
nested ternary operators. For hopefully make it easier to read.

It also renames [internal function] to [

clean up dbg_backtrace

This makes the formatting decisions more explicit instead of multiple
nested ternary operators. For hopefully make it easier to read.

It also renames [internal function] to [anonymous] since it usually
signifies an error in a anonymous callback rather than a PHP internal.

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Fix Undefined array key "file" and "line"

E_WARNING: Undefined array key "line"
/home/gerrit/Sites/dokuwiki/dokuwiki/inc/infoutils.php(525)

In the exception::trace this line is labeled as internal

Fix Undefined array key "file" and "line"

E_WARNING: Undefined array key "line"
/home/gerrit/Sites/dokuwiki/dokuwiki/inc/infoutils.php(525)

In the exception::trace this line is labeled as internal function. Of
course it is an assumption that all cases without file are internal
functions.

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Use str_starts_with/str_ends_with

use $auth instanceof AuthPlugin instead of not null check

https, phpdocs,

code style: line breaks

code style: operator spacing

Rector to rename print to echo calls

coding style: control flow whitespaces

coding style: function call spacing

codestyle adjustments: function declaration braces/spaces

codestyle adjustments: function argument spacing

Apply rector fixes to the rest of inc

increase required PHP version to 7.4

Avoid warning in do=check for anonymous users

fixes #3984

Restore fallback when calling git via shell fails

getVersion() now prints Git commit hash

If DokuWiki is running from Git, on Admin page Version will be shown as
`Git YYYY-MM-DD (<COMMIT>)`.

COMMIT is the abbreviated hash if shell_exec() can be us

getVersion() now prints Git commit hash

If DokuWiki is running from Git, on Admin page Version will be shown as
`Git YYYY-MM-DD (<COMMIT>)`.

COMMIT is the abbreviated hash if shell_exec() can be used to retrieve
information from git log, or the full hash otherwise.

Fixes #3877

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Retrieve head commit from packed-refs file

Fixes #3877

Ensure shell_exec() is available before calling it

Fixes #3876