proxy.php

<?php

/**
 * @file
 * Implements a Solr proxy.
 *
 * Currently requires json_decode which is bundled with PHP >= 5.2.0.
 *
 * You must download the SolrPhpClient and store it in the same directory as this file.
 *
 *   http://code.google.com/p/solr-php-client/
 */

require_once(dirname(__FILE__) . '/SolrPhpClient/Apache/Solr/Service.php');

solr_proxy_main();

/**
 * Executes the Solr query and returns the JSON response.
 */
function solr_proxy_main() {
  if (isset($_POST['query'])) {
    $params = array();
    $keys = '';
    $core = '';

    // The names of Solr parameters that may be specified multiple times.
    $multivalue_keys = array('bf', 'bq', 'facet.date', 'facet.date.other', 'facet.field', 'facet.query', 'fq', 'pf', 'qf');

    $pairs = explode('&', $_POST['query']);
    foreach ($pairs as $pair) {
      list($key, $value) = explode('=', $pair, 2);
      $value = urldecode($value);
      if (in_array($key, $multivalue_keys)) {
        $params[$key][] = $value;
      }
      elseif ($key == 'q') {
        $keys = $value;
      }
      elseif ($key == 'core') {
        $core = "$value/";
      }
      else {
        $params[$key] = $value;
      }
    }

    // Replace these arguments as needed.
    $solr = new Apache_Solr_Service('example.solrstuff.org', 80, '/solrjs/' . $core);

    try {
      $response = $solr->search($keys, $params['start'], $params['rows'], $params);
    }
    catch (Exception $e) {
      die($e->__toString());
    }

    print $response->getRawResponse();
  }
}