PHP HashMap 怎樣處理過期數(shù)據(jù)

在PHP中，可以使用鍵值對數(shù)組來模擬HashMap的功能。如果需要處理過期數(shù)據(jù)，可以在存儲數(shù)據(jù)時同時存儲數(shù)據(jù)的過期時間，然后定時檢查數(shù)據(jù)的過期時間并進行清理。

以下是一個簡單的示例代碼來處理過期數(shù)據(jù)：

class HashMap {
  private $data = [];

  public function put($key, $value, $expirationTime) {
    $this->data[$key] = ['value' => $value, 'expirationTime' => $expirationTime];
  }

  public function get($key) {
    if (isset($this->data[$key])) {
      $currentTime = time();
      if ($this->data[$key]['expirationTime'] > $currentTime) {
        return $this->data[$key]['value'];
      } else {
        unset($this->data[$key]);
        return null;
      }
    } else {
      return null;
    }
  }

  public function remove($key) {
    unset($this->data[$key]);
  }

  public function cleanupExpiredData() {
    $currentTime = time();
    foreach ($this->data as $key => $value) {
      if ($value['expirationTime'] <= $currentTime) {
        unset($this->data[$key]);
      }
    }
  }
}

// Example usage
$map = new HashMap();
$map->put('key1', 'value1', time() + 60); // Set expiration time to be 60 seconds from now
$map->put('key2', 'value2', time() + 120); // Set expiration time to be 120 seconds from now

// Retrieve data
echo $map->get('key1') . "\n"; // Output: value1
echo $map->get('key2') . "\n"; // Output: value2

// Wait until data expires
sleep(61);

// Cleanup expired data
$map->cleanupExpiredData();

// Data should be removed
echo $map->get('key1') . "\n"; // Output: null
echo $map->get('key2') . "\n"; // Output: value2 (still valid)

在上面的示例中，put方法用于存儲數(shù)據(jù)和過期時間，get方法用于獲取數(shù)據(jù)并檢查是否過期，cleanupExpiredData方法用于清理過期數(shù)據(jù)?？梢愿鶕?jù)實際需求修改和擴展這個類來滿足更復(fù)雜的場景。