Avoid variable function invocation

Closes GH-586.

Fix: Remove extra closing tag

Closes GH-589.

Fix: Add type and return type declaration (#587)

Remove arguments identical to default values of parameters

Closes GH-583.

Inline unnecessary local variables

Closes GH-582.

Fix: Remove unused local variables

Closes GH-578.

Remove get_magic_quotes_gpc (#575)

Fix: Remove unused local variable

Closes GH-576.

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.