Counting the number of multi-byte characters

Question

I have text containing multi-byte characters as shown：

ウィキペディア、百科事典。

台数（λ - 、lambda - ）はする。 1930年代だ。関数s（x、y）= x * x +入力xである。 x↦xとy ↦yは変数の名前は。また、（x、y）↦x * x + y * yと（u、v）↦u * u + v * vは.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​​3210 field with attribute of maxlength = 150。

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

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）。