php实现网约车代码

以下是一个简化版的网约车系统PHP实现示例，包含核心功能模块和代码片段：

数据库设计

创建MySQL数据库表结构：

CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL,
    password VARCHAR(255) NOT NULL,
    user_type ENUM('driver', 'passenger') NOT NULL
);

CREATE TABLE vehicles (
    id INT AUTO_INCREMENT PRIMARY KEY,
    driver_id INT NOT NULL,
    vehicle_type VARCHAR(50) NOT NULL,
    license_plate VARCHAR(20) NOT NULL,
    FOREIGN KEY (driver_id) REFERENCES users(id)
);

CREATE TABLE rides (
    id INT AUTO_INCREMENT PRIMARY KEY,
    passenger_id INT NOT NULL,
    driver_id INT,
    pickup_location VARCHAR(255) NOT NULL,
    dropoff_location VARCHAR(255) NOT NULL,
    status ENUM('requested', 'accepted', 'completed', 'cancelled') DEFAULT 'requested',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (passenger_id) REFERENCES users(id),
    FOREIGN KEY (driver_id) REFERENCES users(id)
);

用户注册功能

function registerUser($username, $password, $userType) {
    $hashedPassword = password_hash($password, PASSWORD_DEFAULT);
    $stmt = $pdo->prepare("INSERT INTO users (username, password, user_type) VALUES (?, ?, ?)");
    return $stmt->execute([$username, $hashedPassword, $userType]);
}

叫车请求处理

function requestRide($passengerId, $pickup, $dropoff) {
    $stmt = $pdo->prepare("INSERT INTO rides (passenger_id, pickup_location, dropoff_location) VALUES (?, ?, ?)");
    $stmt->execute([$passengerId, $pickup, $dropoff]);
    return $pdo->lastInsertId();
}

司机接单功能

function acceptRide($driverId, $rideId) {
    $stmt = $pdo->prepare("UPDATE rides SET driver_id = ?, status = 'accepted' WHERE id = ? AND status = 'requested'");
    return $stmt->execute([$driverId, $rideId]);
}

行程完成处理

function completeRide($rideId) {
    $stmt = $pdo->prepare("UPDATE rides SET status = 'completed' WHERE id = ? AND status = 'accepted'");
    return $stmt->execute([$rideId]);
}

位置计算

使用Haversine公式计算两点间距离：

function calculateDistance($lat1, $lon1, $lat2, $lon2) {
    $earthRadius = 6371;
    $dLat = deg2rad($lat2 - $lat1);
    $dLon = deg2rad($lon2 - $lon1);
    $a = sin($dLat/2) * sin($dLat/2) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * sin($dLon/2) * sin($dLon/2);
    $c = 2 * atan2(sqrt($a), sqrt(1-$a));
    return $earthRadius * $c;
}

司机调度算法

function findNearestDriver($latitude, $longitude) {
    $stmt = $pdo->query("SELECT users.id, vehicles.vehicle_type FROM users 
                        JOIN vehicles ON users.id = vehicles.driver_id
                        WHERE users.user_type = 'driver'");

    $nearestDriver = null;
    $minDistance = PHP_FLOAT_MAX;

    while ($driver = $stmt->fetch()) {
        $distance = calculateDistance($latitude, $longitude, $driver['lat'], $driver['lon']);
        if ($distance < $minDistance) {
            $minDistance = $distance;
            $nearestDriver = $driver;
        }
    }

    return $nearestDriver;
}

注意：实际项目中需要添加更多安全验证、错误处理和支付集成等功能。此示例使用PDO进行数据库操作，实际部署时应使用预处理语句防止SQL注入。