note 129369 added to class.weakmap

Keep in mind that if Enum case is put as a key to WeakMap, it will never be removed because it will always have unless 1 reference to it under the hood (not sure why, probably because enum is basically a constant). Therefore, both WeakMaps below will always have key Enum::Case. However, you still are able to unset it manually: $weakMap = new WeakMap(); $object = Enum::Case; $weakMap[$object] = 123; unset($object); var_dump($weakMap->count()); // 1 /// $weakMap = new WeakMap(); $weakMap[Enum::Case] = 123; var_dump($weakMap->count()); // 1 /// $weakMap = new WeakMap(); $weakMap[Enum::Case] = 123; unset($weakMap[Enum::Case]); var_dump($weakMap->count()); // 0 ---- Server IP: 45.112.84.4 Probable Submitter: 80.90.13.131 (proxied: 2001:56a:7a3b:d100:b857:c1b2:f4c:be7c) ---- Manual Page -- https://php.net/manual/en/class.weakmap.php Edit -- https://main.php.net/note/edit/129369 Del: integrated -- https://main.php.net/note/delete/129369/integrated Del: useless -- https://main.php.net/note/delete/129369/useless Del: bad code -- https://main.php.net/note/delete/129369/bad+code Del: spam -- https://main.php.net/note/delete/129369/spam Del: non-english -- https://main.php.net/note/delete/129369/non-english Del: in docs -- https://main.php.net/note/delete/129369/in+docs Del: other reasons-- https://main.php.net/note/delete/129369 Reject -- https://main.php.net/note/reject/129369 Search -- https://main.php.net/manage/user-notes.php