Uncaught Error: Call to undefined function CodeIgniter\locale_set_default() in C:\xampp\htdocs\CodeIgniter4

Migrating from CI3 to CI4 on a current production enviroment could produce the common error when extension=intl is not enabled in php.ini.

To fix this:

• Open the php.ini file:
• Uncomment the following line (extension=intl)