PHP 양식 처리: 양식 데이터 차트 표시 및 통계

$name = $_POST['name'];
$email = $_POST['email'];

// 连接数据库
$host = 'localhost';
$user = 'username';
$password = 'password';
$database = 'dbname';
$conn = mysqli_connect($host, $user, $password, $database);

// 插入数据
$query = "INSERT INTO users (name, email) VALUES ('$name', '$email')";
mysqli_query($conn, $query);
mysqli_close($conn);

<canvas id="myChart"></canvas>
<script>
    // 获取数据
    <?php
        $query = "SELECT * FROM users";
        $result = mysqli_query($conn, $query);
        $data = array();
        while ($row = mysqli_fetch_assoc($result)) {
            $data[] = $row;
        }
        mysqli_close($conn);
        echo "var data = " . json_encode($data) . ";";
    ?>

    // 绘制图表
    var ctx = document.getElementById('myChart').getContext('2d');
    var chart = new Chart(ctx, {
        type: 'bar',
        data: {
            labels: data.map(function(item) {
                return item.name;
            }),
            datasets: [{
                label: '表单数据统计',
                data: data.map(function(item) {
                    return item.email;
                }),
                backgroundColor: 'rgba(75, 192, 192, 0.2)',
                borderColor: 'rgba(75, 192, 192, 1)',
                borderWidth: 1
            }]
        },
        options: {
            scales: {
                y: {
                    beginAtZero: true
                }
            }
        }
    });
</script>