Open remote gzip XML file for use with SimpleXML

I'm having trouble retrieving and decompressing a remote gzip XML file.

To get the file I'm using:

$url = 'http://www.domain.com/xml.gzip';
$linkToXmlFile = fopen("compress.zlib://$url", "r");

Then I've tried:

try {
    $xml = new SimpleXmlElement($rawFeed);
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}

To no avail.

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Tried this ?

$xml = new SimpleXMLElement("compress.zlib://$url", NULL, TRUE);