(PECL solr >= 0.9.2)
SolrInputDocument::getField — Retrieves a field by name
public SolrInputDocument::getField ( string $fieldName ) : SolrDocumentField
Retrieves a field in the document.
fieldName
The name of the field.
Returns a SolrDocumentField object on success and false on failure.
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https://www.php.net/manual/en/solrinputdocument.getfield.php