(PECL solr >= 0.9.2)
SolrDocument::clear — Drops all the fields in the document
public SolrDocument::clear ( ) : bool
Resets the current object. Discards all the fields and resets the document boost to zero.
This function has no parameters.
Returns true
on success or false
on failure.
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https://www.php.net/manual/en/solrdocument.clear.php