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php实现电梯

2026-01-29 17:36:13PHP

PHP实现电梯逻辑

电梯系统的核心逻辑包括状态管理、请求处理和移动控制。以下是一个简化的PHP实现方案：

电梯类结构

class Elevator {
    private $currentFloor = 1;
    private $direction = 'idle'; // 'up', 'down', 'idle'
    private $requestedFloors = [];
    private $maxFloor;

    public function __construct($maxFloor) {
        $this->maxFloor = $maxFloor;
    }
}

请求处理方法

public function requestFloor($floor) {
    if ($floor > $this->maxFloor || $floor < 1) {
        throw new Exception("Invalid floor request");
    }

    if (!in_array($floor, $this->requestedFloors)) {
        $this->requestedFloors[] = $floor;
        $this->determineDirection();
    }
}

方向决策逻辑

private function determineDirection() {
    if (empty($this->requestedFloors)) {
        $this->direction = 'idle';
        return;
    }

    $higherFloors = array_filter($this->requestedFloors, 
        fn($f) => $f > $this->currentFloor);
    $lowerFloors = array_filter($this->requestedFloors,
        fn($f) => $f < $this->currentFloor);

    if ($this->direction === 'up' && !empty($higherFloors)) return;
    if ($this->direction === 'down' && !empty($lowerFloors)) return;

    $this->direction = !empty($higherFloors) ? 'up' : 
        (!empty($lowerFloors) ? 'down' : 'idle');
}

移动控制

public function move() {
    if ($this->direction === 'idle') return;

    $nextFloor = $this->currentFloor + ($this->direction === 'up' ? 1 : -1);
    echo "Moving from {$this->currentFloor} to {$nextFloor}\n";
    $this->currentFloor = $nextFloor;

    if (in_array($nextFloor, $this->requestedFloors)) {
        $this->stopAtFloor($nextFloor);
    }
}

private function stopAtFloor($floor) {
    $index = array_search($floor, $this->requestedFloors);
    unset($this->requestedFloors[$index]);
    echo "Stopping at floor {$floor}\n";
    $this->determineDirection();
}

使用示例

$elevator = new Elevator(10);
$elevator->requestFloor(5);
$elevator->requestFloor(3);
$elevator->requestFloor(7);

while (true) {
    $elevator->move();
    sleep(1); // 模拟移动时间
}

数据库设计

对于需要持久化的电梯系统，建议的MySQL表结构：

CREATE TABLE elevator_requests (
    id INT AUTO_INCREMENT PRIMARY KEY,
    floor_number INT NOT NULL,
    direction ENUM('up', 'down') NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    status ENUM('pending', 'completed') DEFAULT 'pending'
);

CREATE TABLE elevator_status (
    elevator_id INT PRIMARY KEY,
    current_floor INT DEFAULT 1,
    direction ENUM('up', 'down', 'idle') DEFAULT 'idle',
    last_updated TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);