Drupal 6.x

Hi guys

I try login in my site but i can't do it. Show message :

"Sorry, unrecognized username or password. Have you forgotten your password?"

It only occur when i use PHP7

i edited file /modules/user/user.module in function user_load, i added a line following for debug:

Hi guys.

I 'm tried upgrade my drupal 6.38 to 7.43 .

I disabled all modules , except core modules, put default theme, clear caches, disable url clean and Turn off clean URLs. But an error appear

Now I have a drupal6.2 site. I want to migrate to drupal 8.0.
I have read the process of migrate from drupal 6 to drupal 8 on drupal.org. But there are a lot of details.

Anyone could give me some advices?

I think in this community will have someone did this work. It's better to talk about with you !!
thanks.
My email is zhlccbd@gmail.com

On my site I ONLY want 4 digits in Postal code because I have problems when editor by a mistake make 4 digits and also a space.
I have made subtheme subgarland and got help 6 years ago with some other changes so maybe it's this file where I should change something. Hope some one can help me, please?

themes/subgarland/location.tpl.php

First let me say that I am total Drupal newbie. I'm trying to help a client out on a site he inherited. We have a site cachristmas.com that is running Drupal 6 and had Public Download Count (PDC) installed. I suspected that PDC was interfering with Google Analytics tracking PDF downloads, and while researching that issue I noticed that PDC hasn't been supported for awhile due to a security issue.

Dear,
I have two sites with Drupal 6.38. One of them is a homepage, the second is an adserv. The homepage uses module Internationalization (i18n) 6.x-1.10 and the page is available in 6 languages. The adserv uses module Ad 6.x-2.4. The ads are displayed depends on selected language of homepage. Everything works fine and suddenly it broke down few weeks ago. The ads are the same in various language versions of homepage, but they have to be different.

I will be grateful if someone helps me resolve this problem.