如何在PHP中从phpmyadmin回显具有相同id的所有行

$servername = "数据库服务器地址";
$username = "数据库用户名";
$password = "数据库密码";
$dbname = "数据库名称";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

$id = 1; // 要查询的id值

$sql = "SELECT * FROM mytable WHERE id = $id";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 循环输出每一行数据
    while($row = $result->fetch_assoc()) {
        // 输出每一行数据的具体字段值
        echo "id: " . $row["id"]. " - 列1: " . $row["column1"]. " - 列2: " . $row["column2"]. "<br>";
    }
} else {
    echo "没有找到具有相同id的行";
}

$conn->close();