Number of characters

Example of string	Number of characters	Number of bytes
fox	3	3
The quick brown fox jumps over the lazy dog	43	43
狐	1	3
象	1	3
🐘	1	4
敏捷的棕毛狐狸從懶狗身上躍過	14	28

PHP

PHP: strlen & PHP mb_strlen function

// number of characters
echo mb_strlen("狐", 'UTF-8') . PHP_EOL; // return 1
echo mb_strlen("《王大文 Dawen》", 'UTF-8') . PHP_EOL; // return 11

// string length (number of bytes)
echo strlen("狐") . PHP_EOL; // return 3
echo strlen("《王大文 Dawen》") . PHP_EOL; // return 21

MySQL

MySQL: MySQL CHAR_LENGTH() function

// number of characters
SELECT CHAR_LENGTH("狐"); /* return 1 */
SELECT CHAR_LENGTH("《王大文 Dawen》"); /* return 11 */

// number of bytes
SELECT LENGTH("狐"); /* return 3 */
SELECT LENGTH("《王大文 Dawen》"); /* return 21 */

MySQL :: MySQL 8.0 Reference Manual :: 11.4.1 The CHAR and VARCHAR Types e.g. VARCHAR(5) or CHAR(5) means can hold up to 5 characters.

Excel

Excel: LEN, LENB functions / LEN、LENB 函數 Result of the function LENB is not the same with the result in other programming language.

// number of characters
=LEN("狐") // return 1
=LEN("《王大文 Dawen》") // return 11

// number of bytes
=LENB("狐") // return 2
=LENB("《王大文 Dawen》") // return 16