Server-side rpc.php

<?php
include './db.inc';
include './db_people.inc';
include './db_languages.inc';

$people = new people;
$action = $_REQUEST['action'];

switch($action) {
  case 'markers':
    header("Content-type: application/json");
    $all = $people->load();
    echo json_encode(array('people'=>$all));
    break;

  case 'lang':
    header("Content-type: text/javascript");
    $languages = new languages;
    $found = $languages->search($q);
    foreach($found as $v) echo $v['name'].",";
    break;
}
?>