CodeIgniter4/public/index.php

<?php

/*
 *---------------------------------------------------------------
 * CHECK PHP VERSION
 *---------------------------------------------------------------
 */

$minPhpVersion = '8.1'; // If you update this, don't forget to update `spark`.
if (version_compare(PHP_VERSION, $minPhpVersion, '<')) {
    $message = sprintf(
        'Your PHP version must be %s or higher to run CodeIgniter. Current version: %s',
        $minPhpVersion,
        PHP_VERSION
    );

    exit($message);
}

/*
 *---------------------------------------------------------------
 * SET THE CURRENT DIRECTORY
 *---------------------------------------------------------------
 */

// Path to the front controller (this file)
define('FCPATH', __DIR__ . DIRECTORY_SEPARATOR);

// Ensure the current directory is pointing to the front controller's directory
if (getcwd() . DIRECTORY_SEPARATOR !== FCPATH) {
    chdir(FCPATH);
}

/*
 *---------------------------------------------------------------
 * BOOTSTRAP THE APPLICATION
 *---------------------------------------------------------------
 * This process sets up the path constants, loads and registers
 * our autoloader, along with Composer's, loads our constants
 * and fires up an environment-specific bootstrapping.
 */

// LOAD OUR PATHS CONFIG FILE
// This is the line that might need to be changed, depending on your folder structure.
require FCPATH . '../app/Config/Paths.php';
// ^^^ Change this line if you move your application folder

$paths = new Config\Paths();

// LOAD DOTENV FILE
// Load environment settings from .env files into $_SERVER and $_ENV
require_once $paths->systemDirectory . '/Config/DotEnv.php';
(new CodeIgniter\Config\DotEnv($paths->appDirectory . '/../'))->load();

// DEFINE ENVIRONMENT
if (! defined('ENVIRONMENT')) {
    $env = $_ENV['CI_ENVIRONMENT'] ?? $_SERVER['CI_ENVIRONMENT'] ?? getenv('CI_ENVIRONMENT');
    define('ENVIRONMENT', ($env !== false) ? $env : 'production');
    unset($env);
}

// LOAD THE FRAMEWORK BOOTSTRAP FILE
require rtrim($paths->systemDirectory, '\\/ ') . DIRECTORY_SEPARATOR . 'bootstrap.php';

// Load Config Cache
// $factoriesCache = new \CodeIgniter\Cache\FactoriesCache();
// $factoriesCache->load('config');
// ^^^ Uncomment these lines if you want to use Config Caching.

/*
 * ---------------------------------------------------------------
 * GRAB OUR CODEIGNITER INSTANCE
 * ---------------------------------------------------------------
 *
 * The CodeIgniter class contains the core functionality to make
 * the application run, and does all the dirty work to get
 * the pieces all working together.
 */

$app = Config\Services::codeigniter();
$app->initialize();
$context = is_cli() ? 'php-cli' : 'web';
$app->setContext($context);

/*
 *---------------------------------------------------------------
 * LAUNCH THE APPLICATION
 *---------------------------------------------------------------
 * Now that everything is set up, it's time to actually fire
 * up the engines and make this app do its thang.
 */

$app->run();

// Save Config Cache
// $factoriesCache->save('config');
// ^^^ Uncomment this line if you want to use Config Caching.

// Exits the application, setting the exit code for CLI-based applications
// that might be watching.
exit(EXIT_SUCCESS);