WeakMap::key
(PECL weakref >= 0.2.0)
WeakMap::key — Returns the current key under iteration
Description
public WeakMap::key ( ) : object
Returns the object serving as key in the map, at the current iterating position.
Parameters
This function has no parameters.
Return Values
The object key currently being iterated.
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https://www.php.net/manual/en/weakmap.key.php