"Client does not support authentication protocol requested by server; consider upgrading MySQL client", "mysql_real_connect() error.". code example

Example: 'Client does not support authentication protocol requested by server; consider upgrading MySQL client', sqlState: '08004',

$ mysql -u root -p
Enter password: (enter your root password)

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'your_new_password';
mysql> FLUSH PRIVILEGES;
mysql> quit