如何使用PHP和Vue.js實現圖表上的資料篩選和排序功能

<?php
// 连接数据库
$conn = new mysqli("localhost", "root", "password", "database");

// 查询数据
$sql = "SELECT * FROM students";
$result = $conn->query($sql);

// 将查询结果转化为JSON格式返回给前端
$data = [];
while ($row = $result->fetch_assoc()) {
    $data[] = $row;
}
echo json_encode($data);

// 关闭数据库连接
$conn->close();
?>

new Vue({
    el: "#app",
    data: {
        students: [],
        filteredStudents: []
    },
    mounted() {
        // 发送ajax请求获取数据
        axios.get("data.php").then(response => {
            this.students = response.data;
            this.filteredStudents = response.data;
        });
    },
    methods: {
        filterData() {
            // 根据选择的筛选条件，过滤数据并更新到filteredStudents
        },
        sortData(fieldName, direction) {
            // 根据指定的字段和排序方向，对数据进行排序并更新到filteredStudents
        }
    }
});

<select v-model="ageFilter" @change="filterData">
    <option value="">全部年龄</option>
    <option value="18">18岁</option>
    <option value="19">19岁</option>
    <option value="20">20岁</option>
    <option value="21">21岁</option>
    <option value="22">22岁</option>
</select>

sortData(fieldName, direction) {
    this.filteredStudents.sort((a, b) => {
        return a[fieldName] > b[fieldName] ? 1 : -1;
    });
    if (direction === "desc") {
        this.filteredStudents.reverse();
    }
}

<table>
    <tr v-for="student in filteredStudents">
        <td>{{ student.name }}</td>
        <td>{{ student.age }}</td>
        <td>{{ student.grade }}</td>
    </tr>
</table>