offsetexists

WeakMap::offsetExists

Checks whether a certain object is in the map

ENTITY

Checks whether the passed object is referenced in the map.

ENTITY

object
Object to check for.

ENTITY

Returns ENTITY if the object is contained in the map, ENTITY otherwise.

ENTITY

[!NOTE] Like isset, this method returns ENTITY if the value associated with object is ENTITY, even though the object is still contained in the map.