使用PHP将所有$ _POST数据插入mysql？

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

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

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

// 验证和清理数据
foreach ($_POST as $key => $value) {
    $_POST[$key] = mysqli_real_escape_string($conn, $value);
}

// 构建SQL查询
$sql = "INSERT INTO myTable (column1, column2, column3) VALUES ('" . $_POST['column1'] . "', '" . $_POST['column2'] . "', '" . $_POST['column3'] . "')";

// 执行SQL查询
if ($conn->query($sql) === TRUE) {
    echo "数据插入成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

// 关闭连接
$conn->close();
?>