[WeakMap :: \_\_ construct](https://www.php.net/manual/en/weakmap.construct.php)—構造一個新地圖 [WeakMap :: count](https://www.php.net/manual/en/weakmap.count.php)—計算地圖中實時條目的數量 [WeakMap :: current](https://www.php.net/manual/en/weakmap.current.php)—返回迭代時的當前值 [WeakMap :: key](https://www.php.net/manual/en/weakmap.key.php)—返回正在迭代的當前密鑰 [WeakMap :: next](https://www.php.net/manual/en/weakmap.next.php)—前進到下一個地圖元素 [WeakMap :: offsetExists](https://www.php.net/manual/en/weakmap.offsetexists.php)—檢查地圖中是否存在某個對象 [WeakMap :: offsetGet](https://www.php.net/manual/en/weakmap.offsetget.php)—返回由某個對象指向的值 [WeakMap :: offsetSet](https://www.php.net/manual/en/weakmap.offsetset.php)—用新的鍵值對更新地圖 [WeakMap :: offsetUnset](https://www.php.net/manual/en/weakmap.offsetunset.php)—從地圖上刪除一個條目 [WeakMap :: rewind](https://www.php.net/manual/en/weakmap.rewind.php)—將迭代器[后退](https://www.php.net/manual/en/weakmap.rewind.php)到地圖的開頭 [WeakMap :: valid](https://www.php.net/manual/en/weakmap.valid.php)—返回迭代器是否仍在有效的地圖元素上