Code to check whether an instance of Omeka is using internal JavaScript libraries, instead of using libraries from a CDN. Useful if you'd like your plugin to do the same thing.

omeka_use_internal_js.php

<?php
/**
 * Function to return whether to use local or external JavaScript libraries in
 * Omeka. Useful if you'd like your plugin or theme to honor this setting.
 *
 * Checks presence of, and value for, useInternalJavascripts in
 * application/config/config.ini. If it is not set, returns false. Otherwise,
 * returns boolean value for the setting.
 *
 * @return boolean
 */
function omeka_use_internal_js() {

    // Get Omeka's config file, at application/config/config.ini
    $config = Omeka_Context::getInstance()->getConfig('basic');

    // Set a flag based on config's theme.useInternalJavascripts.
    $useInternalJs = isset($config->theme->useInternalJavascripts)
                   ? (bool) $config->theme->useInternalJavascripts
                   : false;

    return $useInternalJs;
}