function SetMatchMode($mode)
{
assert($mode == SPH_MATCH_ALL || $mode == SPH_MATCH_ANY || $mode == SPH_MATCH_PHRASE || $mode == SPH_MATCH_BOOLEAN || $mode == SPH_MATCH_EXTENDED || $mode == SPH_MATCH_FULLSCAN || $mode == SPH_MATCH_EXTENDED2);
$this->_mode = $mode;
}