在PHP中回应表的总和

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

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

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

// 执行求和操作
$sql = "SELECT SUM(response_count) AS total_response FROM response_table";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 输出总和结果
    while($row = $result->fetch_assoc()) {
        echo "回应表的总和为: " . $row["total_response"];
    }
} else {
    echo "回应表为空";
}

// 关闭连接
$conn->close();
?>