I’m trying to make this work in WordPress using the Sphinx plugin for WordPress. I have all my posts geolocated with meta data and my Sphinx index is configured to use that data. If I do a search in the terminal I can see how the latitude and longitude data is there, for example:

displaying matches:
1. document=267965, weight=2, comment_id=0, post_id=133982, ispost=0, iscomment=0, ispage=1, post_type=1, date_added=Tue Sep 4 16:41:45 2012, city_id=2509463, longitude=-0.015075, latitude=0.674252

I’ve changed the Sphinx plugin for WordPress so it looks where the user is located (I know the city and looking at my database I can have the latitude and longitude easily) and then do the search only around that position. Using your code more or less this way:

if ( isset($_GET['cerca']) && $_GET['cerca'] == ’1′ && isset( $_SESSION['multi_city'] ) ) {
global $wpdb;
$sql = ‘SELECT radians(lat) AS lat, radians(lng) AS lng FROM wp_multicity WHERE city_id = %s’;
$myrows = $wpdb->get_results($wpdb->prepare($sql, $_SESSION['multi_city']));
if (sizeof($myrows) != 0) {
$_latitude = $myrows[0]->lat;
$_longitude = $myrows[0]->lng;
$_radius = 10;
$circle = (float) $_radius * 1.61; // Miles
$sphinx->SetGeoAnchor(‘latitude’, ‘longitude’, (float) deg2rad($_latitude), (float) deg2rad($_longitude));
$sphinx->SetFilterFloatRange(‘@geodist’, 0.0, $circle);
}
}

If I run this code doesn’t find anything, but if I comment the SetGeoAnchor and SetFilterFloatRange lines it works ok, only that it does not do the search in the area I’m interested in.

My Sphinx is version 0.9.9-release (r2117). Any clue what is happening? Thank you.