Bagaimana untuk menulis fungsi statistik trafik laman web yang mudah melalui PHP

CREATE DATABASE traffic;
USE traffic;
CREATE TABLE visits (
    id INT PRIMARY KEY AUTO_INCREMENT,
    date DATE,
    visits INT
);

<?php
// 连接数据库
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "traffic";

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

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

// 获取当前日期
$date = date("Y-m-d");

// 检查今日是否已经有访问记录
$sql = "SELECT * FROM visits WHERE date = '$date'";
$result = $conn->query($sql);

// 如果今日已经有访问记录，则增加访问量
if ($result->num_rows > 0) {
    $row = $result->fetch_assoc();
    $visits = $row["visits"] + 1;
    $sql = "UPDATE visits SET visits = $visits WHERE date = '$date'";
    $conn->query($sql);
} else {
    // 如果今日没有访问记录，则创建新的访问记录并将访问量设置为1
    $sql = "INSERT INTO visits (date, visits) VALUES ('$date', 1)";
    $conn->query($sql);
}

// 关闭数据库连接
$conn->close();
?>

<?php
// 连接数据库
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "traffic";

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

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

// 获取总访问量
$sql = "SELECT SUM(visits) AS totalVisits FROM visits";
$result = $conn->query($sql);
$row = $result->fetch_assoc();
$totalVisits = $row["totalVisits"];

// 关闭数据库连接
$conn->close();
?>

<p>网站总访问量：<?php echo $totalVisits; ?>次</p>