(PECL weakref >= 0.2.0)
WeakMap::offsetExists — Checks whether a certain object is in the map
public WeakMap::offsetExists ( object $object ) : bool
Checks whether the passed object is referenced in the map.
object
Object to check for.
Returns true if the object is contained in the map, false otherwise.
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https://www.php.net/manual/en/weakmap.offsetexists.php