Lettura DOM

[starcraftworld]

$xml=fread($fp,filesize("file.xml"));
    $dom->loadXML($xml);
    $root=$dom->documentElement;
    if ($nodeengine=$root->getElementsByTagName("engine")&&$nodeactive=$root->getElementsByTagName("active"))
        if ($nodeengine->item(0)->nodeValue=="on"&&$nodeactive->item(0)->nodeValue=="off")
            echo "OK"; 

Produce l'errore:

Call to a member function item() on a non-object

[filippo.toso]

Che cosa restituisce questo codice?

var_dump($nodeengine); 

[starcraftworld]

bool(true)

[filippo.toso]

 if (($nodeengine = $root->getElementsByTagName("engine")) &&
($nodeactive = $root->getElementsByTagName("active"))) 

[starcraftworld]

ah già...perfetto, grazie mille.