function createNLC($kml_data_file, $connection_timeout = 60)
{
$client_timestamp = getOrDefault('t', 0);
$client_kmls = getOrDefault('client_kmls', '');
if ($client_kmls != '') {
$client_kml_list = array_fill_keys(explode(',', $client_kmls), '');
} else {
$client_kml_list = array();
}
#keep connection alive for $connection_timeout seconds
$start = microtime(true);
set_time_limit($connection_timeout + 1);
$new_data = False;
for ($i = 0; $i < $connection_timeout; $i += 1) {
clearstatcache();
$file_mod = filemtime($kml_data_file);
echo "<!--" . $file_mod . "-->\n";
if ($file_mod > $client_timestamp) {
$add_del_keep = getSyncLists($client_kml_list, $kml_data_file);
$kml = makeNLCUpdate($add_del_keep[0], $add_del_keep[1], $add_del_keep[2], $file_mod, $connection_timeout);
outputKML($kml);
$new_data = True;
echo "</kml>";
exit(0);
#need to break the loop.
$i = $connection_timeout;
}
time_sleep_until($start + $i + 1);
}
#Make sure to provide the cookie if no changes detected. Else NL loses cookie and dup. features
if (!$new_data) {
$kml = "\n <NetworkLinkControl>\n <minRefreshPeriod>1</minRefreshPeriod>\n <maxSessionLength>-1</maxSessionLength>\n <cookie><![CDATA[t=%s&client_kmls=%s]]></cookie> \n </NetworkLinkControl>\n";
echo sprintf($kml, $client_timestamp, $client_kmls);
}
}
function syncTouchscreenChoices($kml_data_file)
{
$touch_kml = trim(getOrDefault('touch_kml', ''));
$touch_action = getOrDefault('touch_action', '');
$kml_url_list = getKmlListUrls($kml_data_file);
# If delete action, remove element from array
if ($touch_action == 'delete' && in_array($touch_kml, $kml_url_list)) {
$index = array_search($touch_kml, $kml_url_list);
unset($kml_url_list[$index]);
writeKmlListFile($kml_data_file, $kml_url_list);
} else {
if ($touch_action == 'add' && !in_array($touch_kml, $kml_url_list)) {
$kml_url_list[md5($touch_kml)] = $touch_kml;
writeKmlListFile($kml_data_file, $kml_url_list);
}
}
}
