php签到系统源码

<?php
// 数据库连接
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "dbname";

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

if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 用户签到
function sign_in($user_id) {
    global $conn;
    $date = date('Y-m-d');
    $sql = "INSERT INTO sign_in_records (user_id, date) VALUES ('$user_id', '$date') ON DUPLICATE KEY UPDATE date = '$date'";
    if ($conn->query($sql) === TRUE) {
        echo "签到成功";
    } else {
        echo "签到失败: " . $conn->error;
    }
}

// 用户签到记录
function get_sign_in_records($user_id) {
    global $conn;
    $sql = "SELECT date FROM sign_in_records WHERE user_id = '$user_id' ORDER BY date DESC";
    $result = $conn->query($sql);
    if ($result->num_rows > 0) {
        while($row = $result->fetch_assoc()) {
            echo "日期: " . $row["date"]. "<br>";
        }
    } else {
        echo "没有签到记录";
    }
}

// 示例调用
$user_id = 1;
sign_in($user_id);
get_sign_in_records($user_id);

$conn->close();
?>