PHP Manual: Set matches sorting mode

public bool SphinxClient::setSortMode ( int $mode [, string $sortby ] )

Sets matches sorting mode. See available modes below.

**Sorting modes**
Constant	Description
SPH_SORT_RELEVANCE	Sort by relevance in descending order (best matches first).
SPH_SORT_ATTR_DESC	Sort by an attribute in descending order (bigger attribute values first).
SPH_SORT_ATTR_ASC	Sort by an attribute in ascending order (smaller attribute values first).
SPH_SORT_TIME_SEGMENTS	Sort by time segments (last hour/day/week/month) in descending order, and then by relevance in descending order.
SPH_SORT_EXTENDED	Sort by SQL-like combination of columns in ASC/DESC order.
SPH_SORT_EXPR	Sort by an arithmetic expression.

Returns TRUE on success or FALSE on failure.

SphinxClient::setSortMode