gistfile1.txt

$result = $client->search_prefix(array(
    'auth' => $auth,
    'query' =>
        array(
            'operator' => 'and',
            'val1' => array(
                'operator' => 'equals',
                'val1' => 'type',
                'val2' => 'assignment'),
            'val2' => array(
                'operator' => 'greater',
                'val1' => 'prefix_length',
                'val2' => '32'),
            'val3' => array(
                'operator' => 'equals',
                'val1' => 'family',
                'val2' => '4')
        )
));