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SolrDisMaxQuery::addBigramPhraseField — Adds a Phrase Bigram Field (pf2 parameter)
$field
   , string $boost
   [, string $slop
  ] )Adds a Phrase Bigram Field (pf2 parameter) output format: field~slop^boost OR field^boost Slop is optional
field
boost
slop
Example #1 SolrDisMaxQuery::addBigramPhraseField() example
<?php
$dismaxQuery = new SolrDisMaxQuery("lucene");
$dismaxQuery
    ->addBigramPhraseField('cat', 2, 5.1)
    ->addBigramPhraseField('feature', 4.5)
;
echo $dismaxQuery;
?>
The above example will output something similar to:
q=lucene&defType=edismax&pf2=cat~5.1^2 feature^4.5