http://stackoverflow.com/questions/17494784/searching-a-particular-index-using-sphinx-from-multiple-indexes-through-php-sc
for one index
$res = $cl->Query($query,"src1");
for multiple indexes
$res = $cl->Query($query,"src1 src2 src3 src4");
sphinx query multiple indexes in php,布布扣,bubuko.com
sphinx query multiple indexes in php
原文：http://www.cnblogs.com/miaoz/p/3595516.html