PHP mb_substr() not working correctly?

Question

This code

print mb_substr('éxxx', 0, 1);

prints an empty space :(

It is supposed to print the first character, é. This seems to work however:

print mb_substr('éxxx', 0, 2);

But it's not right, because (0, 2) means 2 characters...

Answer 1

Try passing the encoding parameter to mb_substr, as such:

print mb_substr('éxxx', 0, 1, 'utf-8');

The encoding is never detected automatically.