class aClass {

    public static function directWrite($message) {

        echo 'this is a static function from aClass !';

        echo "\n";

        echo $message;

        echo "\n";

    }

    function write($message) {

        echo 'this is a normal function from aClass !';

        echo "\n";

        echo $message;

        echo "\n";

    }

}

function test($echo)

{

    echo 'this is a single global function !';

    echo $echo, "\n";

}

$params = array("hello world ! all of you ");

$param='hello world ! just you ';

$method='test';

echo "\n ";

call_user_func_array($method, $params);

echo "\n ";

$method($param);

echo "\n ";

call_user_func_array(array('aClass', "directWrite"), $params);

$obj = new aClass();

$method='write';

echo "\n ";

call_user_func_array(array($obj, $method), $params);

echo "\n ";

$obj->{$method}($param);