php实现商品秒杀

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

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

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

// 获取商品信息
$sql = "SELECT stock FROM products WHERE id = 1";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    $row = $result->fetch_assoc();
    $stock = $row['stock'];
} else {
    echo "商品不存在";
    exit();
}

// 检查库存
if ($stock <= 0) {
    echo "商品已售罄";
    exit();
}

// 减少库存
$sql = "UPDATE products SET stock = stock - 1 WHERE id = 1";
if ($conn->query($sql) === TRUE) {
    echo "秒杀成功";
} else {
    echo "秒杀失败: " . $conn->error;
}

$conn->close();
?>