default_charset = "utf-8"

[client]
default-character-set = utf8mb4

[mysql]
default-character-set = utf8mb4

[mysqld]
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
skip-character-set-client-handshake

AddDefaultCharset utf-8

SHOW VARIABLES WHERE Variable_name LIKE 'character_set_%' OR Variable_name LIKE 'collation%'

character_set_client    utf8mb4
character_set_connection    utf8mb4
character_set_database  utf8mb4
character_set_filesystem    binary
character_set_results   utf8mb4
character_set_server    utf8mb4
character_set_system    utf8
collation_connection    utf8mb4_unicode_ci
collation_database  utf8mb4_unicode_ci
collation_server    utf8mb4_unicode_ci

header('Content-type: text/html; charset=utf-8');

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

<form accept-charset="utf-8" ... >