(PECL solr >= 0.9.2)
SolrQuery::setHighlightAlternateField — Specifies the backup field to use
public SolrQuery::setHighlightAlternateField ( string $field [, string $field_override ] ) : SolrQuery
If a snippet cannot be generated because there were no matching terms, one can specify a field to use as the backup or default summary
field
The name of the backup field
field_override
The name of the field we are overriding this setting for.
Returns the current SolrQuery object, if the return value is used.
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https://www.php.net/manual/en/solrquery.sethighlightalternatefield.php