(PHP 5 >= 5.4.0, PHP 7)
ReflectionFunctionAbstract::getClosureThis — Returns this pointer bound to closure
public ReflectionFunctionAbstract::getClosureThis ( ) : object
This function is currently not documented; only its argument list is available.
This function has no parameters.
 Returns $this pointer. Returns null in case of an error. 
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    https://www.php.net/manual/en/reflectionfunctionabstract.getclosurethis.php