(PHP 5 >= 5.4.0, PHP 7)
ReflectionParameter::isCallable — Returns whether parameter MUST be callable
public ReflectionParameter::isCallable ( ) : bool
This function is currently not documented; only its argument list is available.
This function has no parameters.
Returns true if the parameter is callable, false if it is not or null on failure.
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https://www.php.net/manual/en/reflectionparameter.iscallable.php