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SolrQuery::addExpandSortField is a method in the PHP Solr extension that is used to add a field to the list of fields used for sorting the expanded results of a Solr query.

When executing a Solr query with the "expand" feature enabled, the results can include documents that are similar to the original documents in the result set. The expand.sort parameter specifies the fields to be used for sorting these expanded documents.

To use the SolrQuery::addExpandSortField method, you need to create an instance of the SolrQuery class, and then call the method on that instance, passing the field name and order as parameters.

Here's an example:

php
$query = new SolrQuery();
$query->addExpandSortField("field_name", SolrQuery::ORDER_ASC);


In this example, "field_name" is the name of the field that should be used for sorting the expanded documents, and SolrQuery::ORDER_ASC indicates that the sorting should be done in ascending order. You can use SolrQuery::ORDER_DESC for descending order.

After adding the field to the expand sort list, you can use the SolrClient::query method to execute the query and retrieve the results.

Keep in mind that the Solr server needs to be configured with the expand component for this feature to work. Also, make sure you have installed the Solr extension for PHP and have added it to your project.