如何在PHP和MYSQL上保持博客帖子计数器？

<?php
// 连接数据库
$servername = "数据库服务器地址";
$username = "数据库用户名";
$password = "数据库密码";
$dbname = "数据库名称";

$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("连接数据库失败: " . $conn->connect_error);
}

// 获取当前帖子ID
$post_id = $_GET['post_id'];

// 查询计数器
$sql = "SELECT * FROM post_counters WHERE post_id = '$post_id'";
$result = $conn->query($sql);

// 更新计数器
if ($result->num_rows > 0) {
    // 计数器记录已存在，更新浏览次数
    $row = $result->fetch_assoc();
    $view_count = $row['view_count'] + 1;
    $sql = "UPDATE post_counters SET view_count = '$view_count' WHERE post_id = '$post_id'";
    $conn->query($sql);
} else {
    // 计数器记录不存在，创建新记录
    $view_count = 1;
    $sql = "INSERT INTO post_counters (post_id, view_count) VALUES ('$post_id', '$view_count')";
    $conn->query($sql);
}

// 显示计数器
echo "浏览次数：" . $view_count;

// 关闭数据库连接
$conn->close();
?>