修改密码问题？请各位高手帮帮忙

Question

<?php
session_cache_limiter('private, must-revalidate');
session_start();if(!defined('BASEPATH')){exit('No direct script access allowed');}
include(GLOBAL_URL.FW_URL."apps/basic/meminclude.php");
include(GLOBAL_URL.FW_URL."include/function.inc.php");
include(GLOBAL_URL.FW_URL."include/pdodb.inc.php");
class Memupdpsw extends Meminclude {
function __construct(){
parent::Meminclude();
//$this->load->model("corpinfo_model");
$this->load->model("admin_model");
$this->load->library("session");
header("Content-type: text/html; charset=utf-8");
}   public function index() {
$data=$this->data_include();
    if(empty($_SESSION["psw"]))
{
$_SESSION["psw"]=null;
}
$data["word"]=$_SESSION["psw"];
$this->load->view("memadm/mupdpsw",$data);
unset($_SESSION["psw"]);
}   public  function logicpsw(){
$data=array();
$old_psw=filterform($this->input->post("old_psw"));
$new_psw=filterform($this->input->post("new_psw"));
$new_psw2=filterform($this->input->post("new_psw2"));
if(!$old_psw || !$new_psw || !$new_psw2){
$data["logicinfo"]="密码不能为空";
return $data;
}
if($new_psw!=$new_psw2){
$data["logicinfo"]="新密码两次输入不相同";
 return $data;
}
$len_psw=strlen($new_psw);
if($len_psw<5 || $len_psw>20){
$data["logicinfo"]="6--20个字符，只允许数字和英文字母，有大小区分"; 
return $data;
}
$mem_code=$_SESSION["memriv_code"];
$db_psw=$this->admin_model->getpsw($mem_code);
if($new_psw==$old_psw)
{
$data["logicinfo"]="新密码与旧密码不能一样，请修改！";
return $data;
}
$old_psw=jmpsw($old_psw,$mem_code);
        if(md5($db_psw)!=$old_psw){
//$data["logicinfo"]="原密码输入不正确，请核查";
return $data;
}
$data["logicinfo"]="";
$data["new_jmpsw"]=jmpsw($new_psw,$mem_code);
$data["mem_code"]=$mem_code;
return $data;
} public function updform(){                                                                                                                                                                                                                                                 
$data=$this->logicpsw();
        $logic_info=$data["logicinfo"];
if($logic_info){
show_msgbox($logic_info);exit();
}
$this->admin_model->updpsw1($data["mem_code"],$data["new_jmpsw"]);
$_SESSION["psw"]=array("psw"=>new_psw2);
header("location:{$this->mvc_uri}memadm/memupdpsw/index/{$this->adm_name}");
$actstr="<script>alert(\"修改成功\");window.location.href=\"{$this->mvc_uri}memadm/memupdpsw\";</script>";
echo displayhtml($actstr);

}
}
但是就是修改不了密码，该怎样改呢？

Answer 1

我改了一下：在判断旧密码是否正确时
$old_psw=jmpsw($old_psw,$mem_code);
   if(md5($db_psw)!=$old_psw){
 //$data["logicinfo"]="原密码输入不正确，请核查";
return $data;
 }
改成：
$db_psw=$this->admin_model->getpsw($data["mem_code"]);
        if($db_psw!=$old_psw){
 $data["logicinfo"]=$db_psw;
     return $data;
}
经过测试之后发现$db_psw的值为空，为什么呢？

Answer 2

把原密码新密码通通打印出来看看
还有  md5($db_psw)!=$old_psw
我想应该是对表单新输入的密码 $old_psw MD5加密，怎么数据库里存的是明文？ 那么还有什么必要MD5