echo Javascript函数由Php上的Simple Pie函数保存不起作用

this is my first attempt to ask here, hoping for your kind attention =) so here it is, I'm making a simple news aggregator site that will shows random news base on the site viewer location (COUNTRY). I'm using geoplugin and javascript to locate them and store their credentials in a variable that I will use to pass in php to generate specific NEWS, the problem is Simple Pie is not recognizing it, here's my code

 <?php
    $rssLocal = "<script> document.write('http://samplenews.org/' + geoplugin_countryCode().toLowerCase() + '/rss.xml') </script>";
    $rssLocalLink = "http://samplenews/ph/rss.xml";

    echo $rssLocal . ' ORIG <br />';
    echo $rssLocalLink;

    $feed = new SimplePie($rssLocal);
    $feed->set_feed_url($rssLocalLink);
    $feed->enable_cache(true);
    $feed->set_cache_location(storage_path().'/cache');
    $feed->set_cache_duration(60*60*12);
    $feed->set_output_encoding('utf-8');
    $feed->init();
 ?>

by the way, those two echo return the same result like this

http://samplenews.org/ph/rss.xml ORIG

http://samplenews.org/ph/rss.xml