> <kml xmlns = 'http://earth.google.com/kml/2.1'>

That tag identifies the content as being KML (as opposed to some other
flavour of XML)
It isn't present in the output from your php script.
Google's servers may guess the content is KML if the file extension
is .kml, but can't guess if it is .php

>     var geoXml = new google.maps.GGeoXml('http://myfarms.org/test/
> upload_from_db.php');
>     map.addOverlay(geoXml);

That's a v2 function, it isn't going to work in a v3 map

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