PHP를 사용하여 데이터 조사 및 통계 분석 기능을 구현하는 방법

<form method="POST" action="collect_data.php">
  <label for="name">姓名：</label>
  <input type="text" id="name" name="name"><br>
  
  <label for="age">年龄：</label>
  <input type="number" id="age" name="age"><br>
  
  <input type="submit" value="提交">
</form>

// collect_data.php
$name = $_POST["name"];
$age = (int)$_POST["age"];

// 将数据存储到数据库或文件中
// ...

// connect.php
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// save_data.php
require("connect.php");

$name = $_POST["name"];
$age = (int)$_POST["age"];

$sql = "INSERT INTO survey_data (name, age) VALUES ('$name', $age)";

if ($conn->query($sql) === TRUE) {
    echo "数据保存成功";
} else {
    echo "数据保存失败: " . $conn->error;
}

$conn->close();

// analyze_data.php
require("connect.php");

$sql = "SELECT age, COUNT(*) AS count FROM survey_data GROUP BY age";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        echo "年龄: " . $row["age"] . "，人数: " . $row["count"] . "<br>";
    }
} else {
    echo "没有数据";
}

$conn->close();

// display_data.php
require("connect.php");

$sql = "SELECT * FROM survey_data";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
    echo "<table>";
    echo "<tr><th>姓名</th><th>年龄</th></tr>";
    while ($row = $result->fetch_assoc()) {
        echo "<tr><td>" . $row["name"] . "</td><td>" . $row["age"] . "</td></tr>";
    }
    echo "</table>";
} else {
    echo "没有数据";
}

$conn->close();