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SphinxClient::setGeoAnchor is a method in the PHP Sphinx extension that allows you to set a geographical anchor for a search query. This method is used in combination with the Sphinx geo-related search features.

When you set a geographical anchor using this method, you provide a latitude and longitude coordinates to define a reference point. This reference point is used to sort search results based on their proximity to the anchor.

For example, let's say you have a search query for nearby restaurants. You can set the geographical anchor to the user's current location and specify that you want to sort the results by distance. This way, the search results will be ordered based on their proximity to the user's location.

Here is an example of how you can use setGeoAnchor in PHP:

php
// Create a new SphinxClient instance
$cl = new SphinxClient();

// Set the geographical anchor
$latitude = 37.7749;
$longitude = -122.4194;
$cl->setGeoAnchor('latitude', 'longitude', $latitude, $longitude);

// Perform the search query
$result = $cl->query('restaurants');

// Process the search results
// ...


In the example above, 'latitude' and 'longitude' are the attribute names in your Sphinx index that store the location coordinates. $latitude and $longitude are the actual values defining the geographical anchor.

Please note that this is just a basic example, and you would need to adapt it to your specific use case and index structure.