- var_dump: documentation ( source)
<?php
foreach((new ReflectionMethod('DOMNamedNodeMap::getNamedItemNS'))->getParameters() as $parameter) {
echo "Parameter name: ";
var_dump($parameter->getName());
echo "Has type: ";
var_dump($parameter[0]->getType()->getName());
var_dump($parameter[1]->getType()->getName());
var_dump($parameter[3]->getType()->getName());
}