您做错了方法.
从不将您的数据处理代码与演示代码混合使用.

You are doing it wrong way.
Never mix your data manipulation code with presentation code.

首先创建一个函数以获取帖子:

First make a function to get posts:

function get_posts() {
    global $mysqli;
    $sql = "SELECT variable_name, post_name, post_date, post_display 
            FROM blog_posts ORDER BY id DESC LIMIT 5"
    $result = mysqli_query($mysqli, $sql);
    if (!$result) trigger_error(mysqli_error()."[$sql]");
    $date = array();
    while ($row = mysqli_fetch_assoc($result)) {
        $data[] = $row;
    }
}

这样称呼

require_once 'database.inc.php';
$mysqli = mysqli_connect($host, $username, $password, $database);
$data = get_posts();

然后使用此数组显示