如何使用PHP开发微信小程序的运动追踪功能？

<?php
// 验证请求是否来自微信小程序
$signature = $_GET['signature'];
$timestamp = $_GET['timestamp'];
$nonce = $_GET['nonce'];
$token = 'your_token'; // 替换为你自己的token

$token_array = array($token, $timestamp, $nonce);
sort($token_array, SORT_STRING);
$token_string = implode($token_array);
$signature_local = sha1($token_string);

if ($signature != $signature_local) {
    echo 'Invalid request';
    exit;
}

// 处理小程序发送的请求
$method = $_SERVER['REQUEST_METHOD'];
if ($method == 'GET') {
    // 首次验证，返回echostr值
    $echostr = $_GET['echostr'];
    echo $echostr;
} elseif ($method == 'POST') {
    // 处理小程序运动数据
    $data = file_get_contents("php://input");
    $JSON_data = json_decode($data, true);
    // 在这里可以对运动数据进行业务处理，比如保存到数据库等

    // 返回相应的结果给小程序
    $response = array(
        'error_code' => 0,
        'error_message' => 'Success',
    );
    echo json_encode($response);
}
?>

wx.login({
    success: function(res) {
        if (res.code) {
            // 发送运动数据到PHP接口
            wx.getWeRunData({
                success: function(data) {
                    wx.request({
                        url: 'Http://your_domain.com/path/to/php/file.php',
                        method: 'POST',
                        data: {
                            encryptedData: data.encryptedData,
                            iv: data.iv,
                            code: res.code
                        },
                        success: function(response) {
                            console.log(response.data);
                        }
                    });
                },
                fail: function() {
                    console.log('Failed to get WeRunData');
                }
            });
        } else {
            console.log('Failed to login');
        }
    },
    fail: function() {
        console.log('Failed to login');
    }
});