(PHP 5, PHP 7)
ReflectionParameter::allowsNull — Checks if null is allowed
public ReflectionParameter::allowsNull ( ) : bool
Checks whether the parameter allows null.
This function is currently not documented; only its argument list is available.
This function has no parameters.
true if null is allowed, otherwise false
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https://www.php.net/manual/en/reflectionparameter.allowsnull.php