<?php 

$xml_response = '<person>
    <email-address>xzenia1@gmail.com</email-address>  
    <picture-url>http://m...content-available-to-author-only...n.com/mpr/mprx/0_UiHHf6SiF4yuBerHUkfUfkshFpomUIrHMbpBf5Iy4sOYk7FecL4XTLxtdAEl42AXsho9hGzDtRBl</picture-url>
  </person>';

$xml = simplexml_load_string($xml_response);
    foreach($xml as $key => $val)
    {
        echo "$key=>$val" ."\n";
    }

?>