<?php
$dismaxQuery = new SolrDisMaxQuery("lucene");
$dismaxQuery
    ->addPhraseField('cat', 3, 1)
    ->addPhraseField('third', 4, 2)
    ->addPhraseField('source', 55)
;
echo $dismaxQuery;
?>
    
   The above example will output
something similar to:
q=lucene&defType=edismax&pf=cat~1^3 third~2^4 source^55