mysql 显示页面乱码

SHOW VARIABLES LIKE 'character_set_database';
SHOW VARIABLES LIKE 'collation_database';

ALTER DATABASE your_database_name CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

SHOW CREATE TABLE your_table_name;

ALTER TABLE your_table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

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

<?php
$mysqli = new mysqli("localhost", "user", "password", "database");
if ($mysqli->connect_error) {
    die("连接失败: " . $mysqli->connect_error);
}

$mysqli->set_charset("utf8mb4");

$sql = "SELECT * FROM your_table_name";
$result = $mysqli->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 结果";
}
$mysqli->close();
?>