使用php for-loop将动态创建的输入字段中的数据插入到数据库中

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

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

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

<form method="POST" action="">
    <?php
    for ($i = 0; $i < $_POST['field_count']; $i++) {
        echo '<input type="text" name="field[]" placeholder="字段 ' . ($i+1) . '"><br>';
    }
    ?>
    <input type="submit" value="提交">
</form>

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $fields = $_POST['field'];
    
    for ($i = 0; $i < count($fields); $i++) {
        $sql = "INSERT INTO 表名 (字段名) VALUES ('" . $fields[$i] . "')";

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