Fix: Remove unused parameter

* Fix: Remove unused parameter
* Fix: Remove unused local variable

Closes GH-574.

Fix: Remove parameter where argument is never specified

Closes GH-573.

Fix: Remove unused parameter

Closes GH-571.

Fix: Remove unused parameter

Closes GH-572.

Fix: Remove unused references to a global variable (#563)

Remove old countries lists (#569)

Remove duplicated !isset($var) (#570)

Short scalar cast (#531)

Refactor compare_version function (#568)

Redesign Docs.php (#567)

* Fixed typo

* Move PHP 4 & 5 links to "more documentation"

* Change paragraph about URL and move down

* Remove duplication

Drop useless documentation table

Closes GH-560.

Remove fetch_contents and fetch_header (#566)

Fix: Remove useless function

Closes GH-562.

Fix: Remove duplicate key-value pairs (#565)

Fix: Remove unused private property (#561)

Enhancement: Add .editorconfig

Closes GH-554.

Remove superfluous note

Closes GH-558.

Announce PHP 8.2.0alpha2

Use elseif instead of else if

Closes GH-534.

Add void return types

Add void return type to functions with missing or empty return statements.

Closes GH-535.

Ternary to null coalescing

Use null coalescing operator ?? where possible.

Closes GH-528.

No alias functions

Canonical functions shall be used instead of aliases.

Closes GH-530.

No spaces inside parenthesis

For consistency with the rest of the code.

Closes GH-551.

Allow copying and pasting commands to set up the local development environment

Closes GH-552.

Single blank line at eof

A PHP file without end tag should always end with a single empty line feed.

Closes GH-541.