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SolrQuery::getExpandQuery() is a method in PHP Solr extension that is used to retrieve the expand query for a Solr search query. This method is used when you want to perform results grouping or query expansion using the Solr query.

In simple terms, the getExpandQuery() function allows you to retrieve the expanded query that Solr generates based on your existing query. This expanded query can be used to get more relevant search results by including related terms or expanding the search scope.

Here is an example of how you can use getExpandQuery():

php
// Create a new Solr query object
$query = new SolrQuery('example query');

// Enable query expansion
$query->setExpand(true);

// Get the expand query
$expandQuery = $query->getExpandQuery();

// Output the expand query
echo $expandQuery;


This code sets the expand parameter to true in the Solr query, enabling query expansion. Then, it calls getExpandQuery() to retrieve the expanded query. Finally, it outputs the expand query.

Note: This code is just an example and may need further customization based on your specific usage and requirements.