(PECL solr >= 0.9.2)
SolrDocument::offsetSet — Adds a field to the document
public SolrDocument::offsetSet ( string $fieldName , string $fieldValue ) : void
Used when the object is treated as an array to add a field to the document.
fieldName
The name of the field.
fieldValue
The value for this field.
Returns true on success or false on failure.
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https://www.php.net/manual/en/solrdocument.offsetset.php