<?php

    protected static function _filter($string, $user)
    {
        while (preg_match('/\[user:(\w+)\]/', $string, $match)) {
            str_replace('[user:'.$match[1].']', $user->$match[1], $string);
        }
        while (preg_match('/\[company:(\w+)\]/', $string, $match)) {
            str_replace('[company:'.$match[1].']', $user->Company->$match[1], $string);
        }
        return $string;
    )