(PECL solr >= 0.9.2)
SolrInputDocument::merge — Merges one input document into another
Merges one input document into another.
The source document.
If this is TRUE it will replace matching fields in the destination document.
Cette fonction retourne TRUE en cas de succès ou FALSE si une erreur survient. In the future, this will be modified to return the number of fields in the new document.