PHP - 从数组调用函数？

Question

This is what I currently have:

public function setUp() {
    $tests = array(
                'printHello'    =>  array(),    
                'printWorld'    =>  array(),
                'printName' =>  array('Bob'),
            );
}


public function printHello() {
echo "Hello, ";
}

public function printWorld() {
echo "World!";
}

public function printName($name=false) {
echo $name;
}

What I want to do is loop through all the functions and run them consecutively. This is what I had to end up doing, but it just seems like there should be a more efficient way to do this:

foreach($tests as $test=>$parameters) {
    $num_params = count($parameters);
    switch($num_params) {
        case 0:
            $this->$test();
            break;
        case 1:
            $this->$test($parameters[0]);
            break;
        case 2:
            $this->$test($parameters[0],$parameters[1]);
            break;
        case 3:
            $this->$test($parameters[0],$parameters[1],$parameters[2]);
            break;
        default:
            echo "Error! More than 3 parameters for function" . $test . "!";
            exit;
    }       
}

I am using PHP 5.3. Is there a more efficient way to call the functions in a loop?

EDIT: I can't use call_user_func_array because I'm calling non-static methods from within their parent class. Is there another way?