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I'm trying to connect to a MySQL database from Symfony 3 application. But when trying to create MySQL schema from a Symfony console command I get this error: PDO::__construct(): Server sent charset (255) unknown to the client. Please, report to the developers

Both PHP and MySQL are running in Docker containers.

MySQL version: 8.0.1

PHP version: 7.1.3

Driver: pdo_mysql

charset: UTF8

dsn: "mysql:host=mysql;dbname=database;charset=UTF8;"

Any ideas?

MySQL 8 changed the default charset to utfmb4. But some clients don't know this charset. Hence when the server reports its default charset to the client, and the client doesn't know what the server means, it throws this error.

See also https://bugs.mysql.com/bug.php?id=71606

That bug is against the MySQL Connector/C++ so it's affecting more than just PHP.

Okay—I got it to work by changing the character set to utf8, to be compatible with non-upgraded clients. I added this to /etc/my.cnf and restarted mysqld:

[client]

default-character-set=utf8



[mysql]

default-character-set=utf8





[mysqld]

collation-server = utf8_unicode_ci

character-set-server = utf8

I found these settings in an answer from 2010: Change MySQL default character set to UTF-8 in my.cnf?

The accepted answer saved me (thanks, Bill!!!), but I ran into another related issue, just wanted to provide some details on my experience -

After upgrading to MySQL 8.0.11, I experienced the same problem as the OP when using PHP's mysqli_connect() function. In my MySQL directory (in my case, usr/local/mysql), I created the my.cnf file, added the content in the accepted answer, then restarted the MySQL server. However, this produced a new error:

mysqli_connect(): The server requested authentication method unknown to the client [caching_sha2_password]

I added the line default_authentication_plugin = mysql_native_password, so my.cnf now looked like:

[client]

default-character-set=utf8



[mysql]

default-character-set=utf8



[mysqld]

collation-server = utf8_unicode_ci

character-set-server = utf8

default_authentication_plugin = mysql_native_password

and I was good to go!

For additional reference: https://github.com/laradock/laradock/issues/1392

Works for me >

the environment:

localhost

Windows 10

PHP 5.6.31

MYSQL 8

set:

default-character-set=utf8

on:

c:programdatamysqlmysql server 8.0my.ini

• Not works on> C:Program FilesMySQLMySQL Server 5.5my.ini
  

Tools that helps:

C:Program FilesMySQLMySQL Server 8.0bin>mysql -u root -p



mysql> show variables like 'char%';



mysql> show variables like 'collation%';



m/

find section [MySQLi] in your php.ini and add line mysqli.default_charset = "UTF-8". Similar changes my require for section [Pdo_mysql] and [mysqlnd].

Issue seems to be specifically with MySQL version 8.0, and above solution found working with PHP Version 7.2, and solution didn't work with PHP 7.0

I had the same issue to connect to local system.

I checked in the services list (Run->Services.msc->Enter) wampmysqld64 was stopped.

Restarted it. and was able to login.