<?php
function vAlias($alias) {
   global $modx;
   $options = array('friendly_alias_restrict_chars_pattern'=>'/[\/\0\x0B\t\n\r\f\a&=+%#<>"~`@\?\[\]\{\}\|\^\'\\\\]/');
   $res = $modx->newObject('modResource');
   $res->set('alias', $res->cleanAlias($alias, $options));
   $alias = $res->get('alias');
   return $alias;
}