<?php

include "bootstrap.php";

$options = array
(
    'hostname' => SOLR_SERVER_HOSTNAME,
    'login'    => SOLR_SERVER_USERNAME,
    'password' => SOLR_SERVER_PASSWORD,
    'port'     => SOLR_SERVER_PORT,
    'path'     => SOLR_SERVER_PATH,
);

$client = new SolrClient($options);

$doc = new SolrInputDocument();

$doc->addField('id', 334455);
$doc->addField('cat', 'Software');
$doc->addField('cat', 'Lucene');

$doc2 = clone $doc;

$doc2->deleteField('id');
$doc2->addField('id', 334456);

$docs = array($doc, $doc2);

$updateResponse = $client->addDocuments($docs);

/* you will have to commit changes to be written if you didn't use $commitWithin */
$client->commit();

print_r($updateResponse->getResponse());