fusionpbx/resources/classes/xml.php

<?php

if (!class_exists('xml')) {
    class xml {

        /**
         * Escapes xml special characters to html entities and sanitze switch special chars.
         */
        static function sanitize($string) {
            return str_replace('$', '', htmlspecialchars($string, ENT_XML1));
        }

    }
}

?>