php composer.phar require yep/reflection

<?php
class SomeClass {
	private $someProperty;

	protected function someMethod($someArgument) {
		return $someArgument;
	}

	public function getSomeProperty() {
		return $this->someProperty;
	}

	public function setSomeProperty($someProperty) {
		$this->someProperty = $someProperty;
	}
}

class SomeClass2 extends SomeClass {
}

$someClass = new SomeClass();
$reflection = \Yep\Reflection\ReflectionClass::from($class = $someClass);

<?php
$someClass = new SomeClass();

echo $reflection->invokeMethod($method = 'someMethod', $arguments = ['foo']); // 'foo'

<?php
$someClass = new SomeClass();

$reflection->setPropertyValue($property = 'someProperty', $value = 'foo');

echo $someClass->getSomeProperty(); // 'foo'

<?php
$someClass = new SomeClass();
$someClass->setSomeProperty('foo');

echo $reflection->getPropertyValue($property = 'someProperty'); // 'foo';

<?php
$someClass = new SomeClass2();
$someClass->setSomeProperty('foo');

echo $reflection->getParent()->getPropertyValue($property = 'someProperty'); // 'foo';