(PECL solr >= 0.9.2)
SolrDocument::addField — Adds a field to the document
public SolrDocument::addField ( string $fieldName , string $fieldValue ) : bool
This method adds a field to the SolrDocument instance.
fieldName
The name of the field
fieldValue
The value of the field.
Returns true on success or false on failure.
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https://www.php.net/manual/en/solrdocument.addfield.php