更新mysql乱码

-- 查看数据库字符集
SHOW CREATE DATABASE your_database_name;

-- 修改数据库字符集
ALTER DATABASE your_database_name CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- 查看表字符集
SHOW CREATE TABLE your_table_name;

-- 修改表字符集
ALTER TABLE your_table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- 修改列字符集
ALTER TABLE your_table_name MODIFY your_column_name VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

// PHP示例
$mysqli = new mysqli("localhost", "user", "password", "database");
$mysqli->set_charset("utf8mb4");

<!-- HTML示例 -->
<meta charset="UTF-8">