Fix for PHP 8.4

Author: Nightprince

application/config/Boot/production.php

@@ -9,8 +9,10 @@
  |
  | If you set 'display_errors' to '1', CI4's detailed error report will show.
  */
+error_reporting(E_ALL & ~E_DEPRECATED);
+// If you want to suppress more types of errors.
+// error_reporting(E_ALL & ~E_NOTICE & ~E_DEPRECATED & ~E_STRICT & ~E_USER_NOTICE & ~E_USER_DEPRECATED);
 ini_set('display_errors', '0');
-error_reporting(E_ALL & ~E_NOTICE & ~E_DEPRECATED & ~E_STRICT & ~E_USER_NOTICE & ~E_USER_DEPRECATED);
 
 /*
  |--------------------------------------------------------------------------

index.php

@@ -46,18 +46,19 @@
 
 $paths = new App\Config\Paths();
 
-// Location of the framework bootstrap file.
-require rtrim($paths->systemDirectory, '\\/ ') . DIRECTORY_SEPARATOR . 'bootstrap.php';
-
-// Load environment settings from .env files into $_SERVER and $_ENV
-require_once SYSTEMPATH . 'Config/DotEnv.php';
-(new DotEnv(ROOTPATH))->load();
-
 // Define ENVIRONMENT
 if (! defined('ENVIRONMENT')) {
-    define('ENVIRONMENT', env('CI_ENVIRONMENT', 'production'));
+    // @phpstan-ignore-next-line
+    $env = $_ENV['CI_ENVIRONMENT'] ?? $_SERVER['CI_ENVIRONMENT']
+        ?? getenv('CI_ENVIRONMENT')
+        ?: 'production';
+
+    define('ENVIRONMENT', $env);
 }
 
+// Location of the framework bootstrap file.
+require rtrim($paths->systemDirectory, '\\/ ') . DIRECTORY_SEPARATOR . 'bootstrap.php';
+
 // Load Config Cache
 // $factoriesCache = new \CodeIgniter\Cache\FactoriesCache();
 // $factoriesCache->load('config');

system/CodeIgniter.php

@@ -38,22 +38,6 @@
 $benchmark->start('total_execution');
 $benchmark->start('bootstrap');
 
-/*
- * ------------------------------------------------------
- *  Load any environment-specific settings from .env file
- * ------------------------------------------------------
- */
-if (is_file(APPPATH . 'config/Boot/' . ENVIRONMENT . '.php')) {
-    require_once APPPATH . 'config/Boot/' . ENVIRONMENT . '.php';
-} else {
-    // @codeCoverageIgnoreStart{
-    header('HTTP/1.1 503 Service Unavailable.', true, 503);
-    echo 'The application environment is not set correctly.';
-
-    exit(EXIT_ERROR); // EXIT_ERROR
-    // @codeCoverageIgnoreEnd
-}
-
 //--------------------------------------------------------------------
 // CSRF Protection
 //--------------------------------------------------------------------

system/Config/Services.php

@@ -315,7 +315,7 @@ public static function routes($getShared = false)
      * The Router class uses a RouteCollection's array of routes, and determines
      * the correct Controller and Method to execute.
      */
-    public static function router(RouteCollectionInterface $routes = null, bool $getShared = false)
+    public static function router(?RouteCollectionInterface $routes = null, bool $getShared = false)
     {
         if ($getShared === true)
         {