Blank page on the web server

I created an admin sub-directory on the following site and it works OK

https://ci4-strict.tk/admin/

Please note: I have set the writable folder permissions to 0655 and the modified system files ignore the error unless there are any files to write to the writable directory.


Here is the index.php to produce normal errors rather than a blank page:

file: ./public_html/admin/index.php

Code:

<?php DECLARE(STRICT_TYPES=1); ?>
<?php

// Valid PHP Version?
$minPHPVersion = '7.2';
if (phpversion() < $minPHPVersion)
{
    die("Your PHP version must be {$minPHPVersion} or higher to run CodeIgniter. Current version: " . phpversion());
}
unset($minPHPVersion);

// NEW STUFF GOES HERE =========================================================
error_reporting(-1); // regardless

# require '../../app-strict/Views/incs/fred.php';

# define('jj', "\n<br>");
define('LOG_FILE',   '../writable/logs/log-' .date('Y-m-d') .'.php');
define('LOCALHOST', 'localhost'===$_SERVER['SERVER_NAME']);
if(LOCALHOST) :
  define('CI_DEBUG',  FALSE); // bypass (bool) app/Config/oot/development.php
  ini_set('display_errors', '1');

  $_SERVER['CI_ENVIRONMENT'] = 'production';  // bypass .env & .htaccess
  if(0):
    $_SERVER['CI_ENVIRONMENT'] = 'development'; // bypass .env & .htaccess
  endif; 
  $useKint =  FALSE;

# CLEANER -  only shows last error logs and debugbar JSON files
  $ok = @unlink(LOG_FILE);
  $ok = @array_map('unlink', glob("../writable/debugbar/*.json"));
else: 
  define('CI_DEBUG', FALSE); // bypass (bool) app/Config/oot/prdouction.php
  ini_set('display_errors', '0');
  $_SERVER['CI_ENVIRONMENT'] = 'production'; // bypass .env & .htaccess
  $useKint = ! FALSE;
endif;
// NEW STUFF GOES HERE =========================================================



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

// Location of the Paths config file.
// This is the line that might need to be changed, depending on your folder structure.
$pathsPath = FCPATH . '../../app/Config/Paths.php';
// ^^^ Change this if you move your application folder

/*
*---------------------------------------------------------------
* 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.
*/

// Ensure the current directory is pointing to the front controller's directory
chdir(__DIR__);

// Load our paths config file
require $pathsPath;
$paths = new Config\Paths();

// Location of the framework bootstrap file.
$app = require rtrim($paths->systemDirectory, '/ ') . '/bootstrap.php';

/*
*---------------------------------------------------------------
* LAUNCH THE APPLICATION
*---------------------------------------------------------------
* Now that everything is setup, it's time to actually fire
* up the engines and make this app do its thang.
*/
$app->run();