The documentation says:
Returns the negotiated content type or the default content type (i.e. first array entry) if none match.
It would seem that in fact, this method returns the empty string or NULL if none match.
vasil rangelov
Newer versions of this extension fix the bug from the previous note.
Still, if you want to ensure there's no match, you can use the array, as the array will remain empty.
I used this fact in the following technique to ensure good content negotiation between application/xhtml+xml and text/html, since IE sends only "*/*" and thus receives application/xhtml+xml if you use the current sample from the documentation.
<?php
$bestContentType = http_negotiate_content_type(array('application/xhtml+xml', 'text/html'),
$contentTypes);
$contentType = (empty($contentTypes) ? 'text/html' : $bestContentType);
http_send_content_type($contentType);
?>
Note that at the time of writing, Opera accepts text/html with this approach, because it places application/xhtml+xml with a lower qualifier.
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