``` function filterNickname($nickname) { $nickname = preg_replace('/[\x{1F600}-\x{1F64F}]/u', '', $nickname); $nickname = preg_replace('/[\x{1F300}-\x{1F5FF}]/u', '', $nickname); $nickname = preg_replace('/[\x{1F680}-\x{1F6FF}]/u', '', $nickname); $nickname = preg_replace('/[\x{2600}-\x{26FF}]/u', '', $nickname); $nickname = preg_replace('/[\x{2700}-\x{27BF}]/u', '', $nickname); $nickname = str_replace(array('"','\''), '', $nickname); return addslashes(trim($nickname)); } ```