Question

With this query:

UPDATE  `arg`.`arg_currency` SET  `symbol` =  '' WHERE  `arg_currency`.`id` =2 LIMIT 1 ;

I get this error:

Warning: #1366 Incorrect string value:
‘\xF0\x90\x80\xA4’ for column ‘symbol’
at row 1

The column symbol was a CHAR(1) utf8_roman_ci, but I’ve both tried to change the collation to _general and to _unicode, and the chars to 4, but I’ve still got the same error.

What am I doing wrong?

(I’ve both tried to insert it via custom php code and via phpmyadmin)

Answer 1

As @CarpeNoctumDC points out, this question explains the problem:

MySQL don't want to store unicode character

MySQL only supports characters from the basic multilingual plane (0x0000 – 0xFFFF).

Your character is out if this plane.

In your case, I would work around it by storing the character as a numeric entity. htmlentities() with the UTF-8 encoding specified should be able to entity it, for example. no, it doesn’t.

This function in the User Contributed Notes of the PHP manual works for me: It converts the character into a numeric entity.

echo utf8tohtml("", true); // echoes 𐀤