Description:
------------


DateInterval::__set_state, DateTimeImmutable::__set_state, DateTime::__set_state, and DateTimeZone::__set_state all have getNumberOfParameters() == 0 for their ReflectionMethod instances

Additionally, the function 'datefmt_set_lenient' seems to have incorrect ReflectionFunction data: it says it has 1 required parameter, but should say 2 required parameters

Test script:
---------------
// https://3v4l.org/jEmee for the full test script

$classes = array('DateInterval', 'DateTimeImmutable', 'DateTime', 'DateTimeZone');
foreach ($classes as $class){ 
    echo "Signature of $class::_set_state\n";
    try{
        $rm = new ReflectionMethod($class, '__set_state');
        var_dump($rm->getNumberOfParameters());
        var_dump($rm->getNumberOfRequiredParameters());
    } catch(Exception $e) {
        echo "$class: " . $e;
    }
}

echo "End of param counts for __set_state\n\n";
var_export(DateTime::__set_state(array(
   'date' => '2017-06-08 05:11:40.907706',
   'timezone_type' => 3,
   'timezone' => 'UTC',
)));
//  DateTime::__set_state();  // would trigger Warning: DateTime::__set_state() expects exactly 1 parameter, 0 given in php shell code on line 1

// See 3v4l link for rest of script

Expected result:
----------------
Reflection counts should be 1 required, 1 total parameter for those __set_state functions.
ReflectionFunction for datefmt_set_lenient should have 2 required, 2 total parameters

Actual result:
--------------
Reflection counts say 0 required, 0 total parameter for those __set_state functions.
ReflectionFunction for datefmt_set_lenient currently shows 1 required, 1 total parameter