Difference mb_convert_case vs mb_strtolower?

Question

PHP

Symfony uses

return mb_convert_case($str, MB_CASE_LOWER, 'UTF-8');

and in Laravel
return mb_strtolower($value, 'UTF-8');
what is the difference and how noticeable?

Answer 1

The only difference is versatility. It is more convenient for someone to change a constant, and for someone an entire function