使用PHP开发抽奖功能的步骤与技巧

CREATE DATABASE lottery_db;
USE lottery_db;

CREATE TABLE prizes (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(50) NOT NULL
);

CREATE TABLE participants (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(50) NOT NULL,
    email VARCHAR(50) NOT NULL
);

CREATE TABLE winners (
    id INT AUTO_INCREMENT PRIMARY KEY,
    prize_id INT,
    participant_id INT,
    FOREIGN KEY (prize_id) REFERENCES prizes(id),
    FOREIGN KEY (participant_id) REFERENCES participants(id)
);

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "lottery_db";

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

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = "SELECT * FROM prizes";
$result = $conn->query($sql);

while($row = $result->fetch_assoc()) {
    echo "Prize: " . $row["name"] . "<br>";
}

if(isset($_POST['submit'])) {
    $name = $_POST['name'];
    $email = $_POST['email'];

    $sql = "INSERT INTO participants (name, email) VALUES ('$name', '$email')";
    $conn->query($sql);
}

$random_prize_sql = "SELECT * FROM prizes ORDER BY RAND() LIMIT 1";
$random_prize_result = $conn->query($random_prize_sql);
$random_prize = $random_prize_result->fetch_assoc();

$random_participant_sql = "SELECT * FROM participants ORDER BY RAND() LIMIT 1";
$random_participant_result = $conn->query($random_participant_sql);
$random_participant = $random_participant_result->fetch_assoc();

$sql = "INSERT INTO winners (prize_id, participant_id) VALUES ('".$random_prize['id']."', '".$random_participant['id']."')";
$conn->query($sql);

echo "Congratulations! Prize: " . $random_prize['name'] . " Winner: " . $random_participant['name'];