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this is the whole code on functions:

public static function smileys($str, $adm = FALSE)
    {
        static $smileys_cache = array();
        if (empty($smileys_cache)) {
            $file = ROOTPATH . 'files/cache/smileys.dat';
            if (file_exists($file) && ($smileys = file_get_contents($file)) !== FALSE) {
                $smileys_cache = unserialize($smileys);

                return strtr($str, ($adm ? array_merge($smileys_cache['usr'], $smileys_cache['adm']) : $smileys_cache['usr']));
            } else {
                return $str;
            }
        } else {
            return strtr($str, ($adm ? array_merge($smileys_cache['usr'], $smileys_cache['adm']) : $smileys_cache['usr']));
        }
    }