(PECL sphinx >= 0.1.0)
SphinxClient::setIndexWeights — Set per-index weights
$weights
) : boolSets per-index weights and enables weighted summing of match weights across different indexes.
weightsAn associative array mapping string index names to integer weights. Default is empty array, i.e. weighting summing is disabled.
成功时返回 TRUE， 或者在失败时返回 FALSE。