[php] Update Codeigniter to v 4 (#7686)

* [php] Update Codeigniter to v 4

* Add writable dir

* Change display name

* Add JIT in php-fpm

frameworks/PHP/codeigniter/.env-dev

@@ -0,0 +1 @@
+CI_ENVIRONMENT = development

frameworks/PHP/codeigniter/README.md

@@ -5,32 +5,29 @@ This is the Codeigniter PHP portion of a [benchmarking test suite](../) comparin
 ### JSON Encoding Test
 Uses the PHP standard [JSON encoder](http://www.php.net/manual/en/function.json-encode.php).
 
-* [JSON test controller](application/controllers/bench.php)
+* [JSON test controller](app/Controllers/Bench.php)
 
 
 ### Data-Store/Database Mapping Test
 Uses the db abstraction class from Codeigniter
 
-* [DB test controller](application/controllers/bench.php)
+* [DB test controller](app/Controllers/Bench.php)
 
 
 ## Infrastructure Software Versions
 The tests were run with:
 
-* [Codeigniter Version 3.1.11](http://ellislab.com/codeigniter)
-* [PHP Version 7.4](http://www.php.net/) with FPM and APC
-* [nginx 1.16.1](http://nginx.org/)
-* [MySQL 8](https://dev.mysql.com/)
+* [Codeigniter Version 4](https://www.codeigniter.com)
 
 ## Test URLs
 ### JSON Encoding Test
 
-http://localhost/index.php/bench/json
+http://localhost/json
 
 ### Data-Store/Database Mapping Test
 
-http://localhost/index.php/bench/db
+http://localhost/db
 
 ### Variable Query Test
 
-http://localhost/index.php/bench/db/2
+http://localhost/queries/2

frameworks/PHP/codeigniter/app/.htaccess

@@ -0,0 +1,6 @@
+<IfModule authz_core_module>
+    Require all denied
+</IfModule>
+<IfModule !authz_core_module>
+    Deny from all
+</IfModule>

frameworks/PHP/codeigniter/app/Common.php

@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * The goal of this file is to allow developers a location
+ * where they can overwrite core procedural functions and
+ * replace them with their own. This file is loaded during
+ * the bootstrap process and is called during the framework's
+ * execution.
+ *
+ * This can be looked at as a `master helper` file that is
+ * loaded early on, and may also contain additional functions
+ * that you'd like to use throughout your entire application
+ *
+ * @see: https://codeigniter4.github.io/CodeIgniter4/
+ */