(PECL solr >= 2.2.0)
SolrQuery::setExpand — Enables/Disables the Expand Component
public SolrQuery::setExpand ( bool $value ) : SolrQuery
Enables/Disables the Expand Component.
value
Bool flag
Example #1 SolrQuery::setExpand() example
<?php
$query = new SolrQuery('lucene');
$query
    ->setExpand(true)
    ->setExpandRows(50)
    ->setExpandQuery('text:product')
    ->addExpandFilterQuery('manu:apple')
    ->addExpandFilterQuery('inStock:true')
    ->addExpandSortField('score', SolrQuery::ORDER_DESC)
    ->addExpandSortField('title', SolrQuery::ORDER_ASC);
echo $query.PHP_EOL;
?> The above example will output something similar to:
q=lucene&expand=true&expand.rows=50&expand.q=text:product&expand.fq=manu:apple&expand.fq=inStock:true&expand.sort=score desc,title asc
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    https://www.php.net/manual/en/solrquery.setexpand.php