(PECL weakref >= 0.2.0)
WeakMap::valid — Returns whether the iterator is still on a valid map element
public WeakMap::valid ( ) : bool
Returns whether the iterator is still on a valid map element.
This function has no parameters.
Returns true if the iterator is on a valid element that can be accessed, false otherwise.
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https://www.php.net/manual/en/weakmap.valid.php