(PHP 5 >= 5.4.0, PHP 7)
ReflectionFunction::getClosure — Returns a dynamically created closure for the function
public ReflectionFunction::getClosure ( ) : Closure
This function is currently not documented; only its argument list is available.
This function has no parameters.
Returns Closure. Returns null in case of an error.
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https://www.php.net/manual/en/reflectionfunction.getclosure.php