Sets a Boost Function (bf parameter)

# SolrDisMaxQuery::setBoostFunction

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SolrDisMaxQuery::setBoostFunction — Sets a Boost Function (bf parameter)

### 説明

public SolrDisMaxQuery::setBoostFunction ( string `$function` ) : SolrDisMaxQuery

Sets Boost Function (bf parameter).

Functions (with optional boosts) that will be included in the user's query to influence the score. Any function supported natively by Solr can be used, along with a boost value. e.g.:

recip(rord(myfield),1,2,3)^1.5

### パラメータ

`function`

### 返り値

SolrDisMaxQuery

### 例

例1 SolrDisMaxQuery::setBoostFunction() example

`<?php
$dismaxQuery = new SolrDisMaxQuery('lucene');
$boostRecentDocsFunction = "recip(ms(NOW,mydatefield),3.16e-11,1,1)";
$dismaxQuery->setBoostFunction($boostRecentDocsFunction);
echo $dismaxQuery.PHP_EOL;
?>`

上の例の出力は、 たとえば以下のようになります。

    q=lucene&defType=edismax&bf=recip(ms(NOW,mydatefield),3.16e-11,1,1)

### 参考