Counting the number of multi-byte characters

Question

I have text containing multi-byte characters as shown:

위키백과, 백과사전.

대수(λ -, lambda -)는 함. 1930년대 다. 함수 s(x, y) = x*x + 입력 x 것이다. x ↦ x 와 y ↦ y 는 변수의 이름은. 또한 (x, y) ↦ x*x + y*y 와 (u, v) ↦ u*u + v*v 는.123456

In a word processor, it gives me a character count of 148.

On a HTML form encoded in UTF-8, it uses up a TEXTAREA field with attribute of maxlength = 150.

Using the PHP function mb_strlen($_POST['text'],'UTF-8'), it returns a value of 152.

Which one is correct?

Answer 1

I'm going to say they all are correct.

With no line endings it is 148.

With line endings it is 150 or 152 depending on the encoding (Windows uses 2 characters per line ending).