(PECL weakref >= 0.1.0)
Weakref::valid — Checks whether the object referenced still exists
public Weakref::valid ( ) : bool
Checks whether the object referenced still exists.
This function has no parameters.
Returns true
if the object still exists and is thus still accessible via Weakref::get(), false
otherwise.
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https://www.php.net/manual/en/weakref.valid.php