<?php

// create a query with a custom start, rows, fields and sort setting
$query = new Solarium_Query_Select;

// you can add a filterquery based on a config array
$query->addFilterQuery(array(
    'key' => 'fq1',
    'tag' => array('populationLimit'),
    'query' => 'population:[1 TO 1000000]',
));

// or create a filterquery instance yourself, using its API
$filterQuery = new Solarium_Query_Select_FilterQuery;
$filterQuery->setKey('fq1')
            ->addTag('populationLimit')
            ->setQuery('population:[1 TO 1000000]');
$query->addFilterQuery($filterQuery);