Mysql prompts Incorrect string value: '\ xF0 \ x9F \ x9B \ xB3 ,... 'For column' option _ value' solution

There was an episode yesterday when the database was restored (it should be three o'clock in the morning:

[Root @ site themes] #/usr/local/mysql/bin/mysql-uweb-p 'admin' web </tmp/web_wp_20160422_687. SQL
Warning: Using a password on the command line interface can be insecure.
ERROR 1366 (HY000) at line 907: Incorrect string value: '\ xF0 \ x9F \ x9B \ xB3,...' for column 'option _ value' at row 1
View the mysql table creation statement:

MySQL

Mysql> show create table web. wp_users \ G
* *************************** 1. row ***************************
Table: wp_users
Create Table: create table 'WP _ users '(
'Id' bigint (20) unsigned not null AUTO_INCREMENT,
'User _ login 'varchar (60) COLLATE utf8mb4_unicode_ci not null default '',
'User _ pass' varchar (255) COLLATE utf8mb4_unicode_ci not null default '',
'User _ nicename 'varchar (50) COLLATE utf8mb4_unicode_ci not null default '',
'User _ email 'varchar (100) COLLATE utf8mb4_unicode_ci not null default '',
'User _ url' varchar (100) COLLATE utf8mb4_unicode_ci not null default '',
'User _ registered' datetime not null default '2017-00-00 00:00:00 ',
'User _ activation_key 'varchar (255) COLLATE utf8mb4_unicode_ci not null default '',
'User _ status' int (11) not null default '0 ',
'Display _ name' varchar (250) COLLATE utf8mb4_unicode_ci not null default '',
Primary key ('id '),
KEY 'user _ login_key '('User _ login '),
KEY 'user _ nicename' ('User _ nicename '),
KEY 'user _ email '('User _ email ')
) ENGINE = MyISAM AUTO_INCREMENT = 2 default charset = utf8mb4 COLLATE = utf8mb4_unicode_ci
Probably because of the character set "utf8mb4" and the problem of restoring the database using the character set twice

Solution:

[Client]
Default-character-set = utf8mb4
[Mysqld]
Character-set-server = utf8mb4
The utf8mb4 character set has many new features. Please Baidu!