(PECL solr >= 2.7.0)
SolrQuery::getHighlightQuery — Return the highlight query
Returns previously set highlight query from the
hl.q parameter.
This parameter allows you to highlight different terms or fields than those being used to retrieve documents.
See the » Highlighting
section for more details.
此函数没有参数。
Returns a string that contains the highlight query of the current SolrQuery,
or null if highlight query is not set.