(PECL solr >= 0.9.2)
SolrQuery::getHighlightAlternateField — Returns the highlight field to use as backup or default
public SolrQuery::getHighlightAlternateField(string $field_override = ?): string
Returns the highlight field to use as backup or default. It accepts an optional override.
field_overrideThe name of the field
Returns a string on success and null if not set.
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https://www.php.net/manual/en/solrquery.gethighlightalternatefield.php