(PECL sphinx >= 0.1.0)
SphinxClient::setGeoAnchor — Set anchor point for a geosphere distance calculations
public SphinxClient::setGeoAnchor ( string $attrlat , string $attrlong , float $latitude , float $longitude ) : bool
Sets anchor point for a geosphere distance (geodistance) calculations and enables them.
Once an anchor point is set, you can use magic "@geodist" attribute name in your filters and/or sorting expressions.
attrlat
Name of a latitude attribute.
attrlong
Name of a longitude attribute.
latitude
Anchor latitude in radians.
longitude
Anchor longitude in radians.
Returns true on success or false on failure.
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https://www.php.net/manual/en/sphinxclient.setgeoanchor.php