(PECL solr >= 0.9.2)
SolrQuery::setTermsIncludeUpperBound — Include the upper bound term in the result set
public SolrQuery::setTermsIncludeUpperBound ( bool $flag ) : SolrQuery
Include the upper bound term in the result set.
flag
 true or false 
Returns the current SolrQuery object, if the return value is used.
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    https://www.php.net/manual/en/solrquery.settermsincludeupperbound.php