PrivateTester

<?php
class PrivateTester
{
    public $object;
    
    public function __construct($object)
    {
        $this->object = $object;
    }
    
    public function __get($name)
    {
        $reflectionObject = new ReflectionObject($this->object);
        $reflectionProperty = $reflectionObject->getProperty($name);
        $reflectionProperty->setAccessible(true);
        return $reflectionProperty->getValue($this->object);
    }
    
    public function __call($method, $parameters)
    {
        $reflectionObject = new ReflectionObject($this->object);
        $reflectionMethod = $reflectionObject->getMethod($method);
        $reflectionMethod->setAccessible(true);
        return $reflectionMethod->invokeArgs($this->object, $parameters);
    }
}

class Foo
{
    private $bar = 'bar';
    
    private function fuzz()
    {
        return 'fuzz';
    }
    
    protected function buzz()
    {
        return 'buzz';
    }
}

$tester = new PrivateTester(new Foo());
echo $tester->bar;
echo $tester->fuzz();
echo $tester->buzz();