查询中的Sphinx属性

Question

有没有办法用OR条件搜索string和float属性？我试过这个：

$s->SetServer('localhost', 3312);
$s->SetMatchMode(SPH_MATCH_EXTENDED2);
$s->SetArrayResult(false);
$s->SetLimits ( ($page-1)*$onsite, $onsite );
$s->SetSortMode(SPH_SORT_EXTENDED, '@id DESC');
$s->Query('@city "London" | floatrange=lat,51.0,51.2');