Templates folder switch for ProcessWire

templates-folder-switch.php

<?php

/**
 * Switch ProcessWire templates directory on $_SERVER['HTTP_HOST']. Type the
 * Hostname as key and the name of the new templates folder as value.
 *
 */

$config->templates = array(
    'mobile.domain.dev' => 'templates-mobile', // domain => templates folder name
);


if (isset($_SERVER['HTTP_HOST']) && isset($config->templates[$_SERVER['HTTP_HOST']], $config->templates)) {
    foreach ($config->templates as $host => $folder) {
        if ($_SERVER['HTTP_HOST'] === $host) {
            // set new paths
            $config->urls->templates = "/site/" . $folder . "/";
            $config->paths->templates = dirname(__DIR__) . $config->urls->templates;
        }
    }
}