phpcms 中文乱码

<meta charset="UTF-8">

header("Content-Type: text/html; charset=utf-8");

$mysqli = new mysqli("localhost", "user", "password", "database");
$mysqli->set_charset("utf8");

CREATE TABLE `table_name` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

ALTER TABLE `table_name` CONVERT TO CHARACTER SET utf8;

<?php
header("Content-Type: text/html; charset=utf-8");

$mysqli = new mysqli("localhost", "user", "password", "database");
if ($mysqli->connect_error) {
    die("连接失败: " . $mysqli->connect_error);
}
$mysqli->set_charset("utf8");

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

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