MivaScript Builtin Function, Miva Merchant 9+
keyword_extract_merge( string, weight ) <mvt:assign name="g.return_value" value="keyword_extract_merge( string, weight )" />
Extracts keywords as described in keyword_extract, but inserts them into a persistent array initialized by keyword_extract_merge_init. The weight value passed in is associated with the results from the current string being analyzed. Return null.