Question

I have this:

$xml = simplexml_load_file('test.xml');
print"<pre>";
print_r($xml);

It printout this:

SimpleXMLElement Object
(
    [b] => SimpleXMLElement Object
        (
            [c] => SimpleXMLElement Object
                (
                    [d] => 543
                )

        )

)

but when I type echo $xml["b"]["c"]["d"]; nothing happens

Answer 1

the print_r is kind of misleading,
actually the $xml is series/array of SimpleXmlElement objects

so

echo (int)$xml->b->c->d;  --- type casting is required

here is some reference you should take a look first

Additional to type casting,
because everything node inside the xml object is either string or int

PHP will auto convert for numeric string to integer,
however, is clearer if you provide the type hinting

var_dump($xml); --- you should see more information on the data type