php用户密码修改代码

 @session_start();
 require_once("../inc/ring_admin.php");
 require_once("../../inc/connect.php");
 require_once("../../admin/inc/function.php");
 ring_login();
 $pwd = get_value('pwd','post');
 $pwd2 = get_value('pwd2','post');
 $pwd3 = get_value('pwd3','post');
 $sql = "select * from gx_member  where m_pwd='".md5($pwd)."' and m_name='".$_SESSION['uid']."'";
 
  if( $pwd2!=$pwd3 || strlen( $pwd2)<6 || strlen( $pwd2)>12 ){
   alert('两次输入的新密码不正确,请重新输入!','');
  }else{   
   if(mysql_num_rows( mysql_query($sql) ) ){
    $sql="Update gx_member set m_pwd='".md5($pwd2)."' where m_name='".$_SESSION['uid']."'";
    mysql_query($sql) or die(mysql_error());
    alert('密码修改成功!','');
   }else{
    alert('旧密码不正确,请重新输入!','');
   }
  }
 
 
?>