(PECL solr >= 0.9.2)
SolrDocument::clear — Drops all the fields in the document
Resets the current object. Discards all the fields and resets the document boost to zero.
锟剿猴拷锟斤拷没锟叫诧拷锟斤拷锟斤拷
锟缴癸拷时锟斤拷锟斤拷 TRUE锟斤拷 锟斤拷锟斤拷锟斤拷失锟斤拷时锟斤拷锟斤拷 FALSE锟斤拷
TRUE
FALSE