<?phpfunction base64_en($str){ $str = base64_encode($str); $str .= randStr(5); $str = base64_encode($str); $str = randStr(3).$str; return $str;}function randStr($len){ $str = "ABCDEFGHIJKLMNOPQRSTUVWSYZabcdefghijklmnopqrstuvwsyz0123456789"; return substr(str_shuffle($str),0,$len);}echo $s1 = base64_en("你好不好");//加密后的串function base64_de($str){ $len = strlen($str); $str = substr($str,3,$len-2); $str = base64_decode($str); $str = substr($str,0,$len-5); $str = base64_decode($str); return $str;}echo " ";echo base64_de($s1);//解密后的串?>