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SolrQuery::setTermsUpperBound is a method in PHP's Solr extension that sets the upper bound for the number of terms returned in a response.

This method is used when performing searches with the Solr search engine and it allows you to limit the number of terms returned in the response.

For example, if you want to retrieve a maximum of 10 terms in a response, you can use the following code:

php
$query = new SolrQuery();
$query->setTermsUpperBound(10);


In the above code, SolrQuery is a class representing a Solr query and setTermsUpperBound(10) sets the upper bound for the number of terms to be 10.

By setting a limit on the number of terms returned, you can control the size of the response and reduce the amount of data transferred. This can be useful when dealing with large term lists or when you only need a limited number of terms for further processing.