MODX Mobile Switch Context Plugin

modX_mobileContext.php

<?php
/* see:
 * http://rtfm.modx.com/revolution/2.x/administering-your-site/contexts/using-one-gateway-plugin-to-manage-multiple-domains
 * "mobileContext" - mobile version context name
 */
if (!isset($scriptProperties['mobileContext']) || empty($scriptProperties['mobileContext'])) {
    return;
}
/* don't execute if in the Manager */
if ($modx->context->get('key') == 'mgr') {
    return;
}
/* get mobile context */
$mctx = $modx->getContext($scriptProperties['mobileContext']);
if ($mctx) {
    if ($_SERVER['HTTP_HOST'] == $mctx->getOption('http_host')) {
        $modx->switchContext($mctx->key);
    }
}