PHP開発のヒント: キャッシュ機能の実装方法

class FileCache
{
    private $cacheDir;

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

    public function get($key)
    {
        $filePath = $this->cacheDir . '/' . $key . '.cache';

        if (file_exists($filePath) && (time() - filemtime($filePath)) < 3600) { // 缓存时间设置为1小时
            $data = file_get_contents($filePath);
            return unserialize($data);
        }

        return false;
    }

    public function set($key, $data)
    {
        $filePath = $this->cacheDir . '/' . $key . '.cache';
        $data = serialize($data);

        file_put_contents($filePath, $data, LOCK_EX);
    }

    public function delete($key)
    {
        $filePath = $this->cacheDir . '/' . $key . '.cache';

        if (file_exists($filePath)) {
            unlink($filePath);
        }
    }
}

$cache = new FileCache('/path/to/cache/dir');

// 从缓存读取数据
$data = $cache->get('key');

// 缓存数据
if ($data === false) {
    // 从数据库或其他地方获取数据
    $data = getDataFromDatabase();

    // 将数据缓存起来
    $cache->set('key', $data);
}

class MemcachedCache
{
    private $memcached;

    public function __construct()
    {
        $this->memcached = new Memcached();
        $this->memcached->addServer('localhost', 11211);
    }

    public function get($key)
    {
        $data = $this->memcached->get($key);

        if ($data !== false) {
            return $data;
        }

        return false;
    }

    public function set($key, $data, $expire = 3600)
    {
        $this->memcached->set($key, $data, $expire);
    }

    public function delete($key)
    {
        $this->memcached->delete($key);
    }
}

$cache = new MemcachedCache();

// 从缓存读取数据
$data = $cache->get('key');

// 缓存数据
if ($data === false) {
    // 从数据库或其他地方获取数据
    $data = getDataFromDatabase();

    // 将数据缓存起来
    $cache->set('key', $data);
}