(PECL solr >= 0.9.2)
SolrQuery::getTermsPrefix — Returns the term prefix
public SolrQuery::getTermsPrefix ( ) : string
Returns the prefix to which matching terms must be restricted. This will restrict matches to only terms that start with the prefix
This function has no parameters.
 Returns a string on success and null if not set. 
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    https://www.php.net/manual/en/solrquery.gettermsprefix.php