如何使用PHP Post检索表单字段值

<form action="process.php" method="post">
  <label for="name">Name:</label>
  <input type="text" name="name" id="name">
  <input type="submit" value="Submit">
</form>

$name = $_POST['name'];
echo "Hello, " . $name;

if (!empty($_POST['name'])) {
  // 执行操作
} else {
  echo "Please enter your name.";
}

// 连接到数据库
$conn = mysqli_connect("localhost", "username", "password", "database");

// 检查连接是否成功
if (!$conn) {
  die("Connection failed: " . mysqli_connect_error());
}

// 获取表单字段值
$name = $_POST['name'];

// 插入数据到数据库
$sql = "INSERT INTO users (name) VALUES ('$name')";

if (mysqli_query($conn, $sql)) {
  echo "Data inserted successfully.";
} else {
  echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}

// 关闭数据库连接
mysqli_close($conn);