Read a file from a different server - php

Question

Reason:
I am a webmaster of 7 sites, and to manage unwanted comments on a contact form I block the IP of bad commentators. Each time i get a new bad IP I have to edit each contact form on all 7 servers, which is very time consuming. What i would like is for the IP addresses to be put in 1 file on my server and just read in my all the other sites.
Current Code: (I have shortened the IP array)
<?php
$deny = array("91.200.14.59", "91.207.7.141");
if (in_array ($_SERVER['REMOTE_ADDR'], $deny)) {
header("location: index.php?page=error404");
exit();
} ?>
Answer Required:
How do i get the above code to read the IP file (array) from another server?
An example of the code would truly be appreciated.
Thanks

Answer 1

I'd be going about this the other way around: keep the list up to date locally (in a version control repository no less), and push the changes using a deploy tool. For instance, Ansible is a neat little tool. Example configuration:
---
- hosts: comment-forms
tasks:
- name: Ensure blacklist is up to date
copy: src=blacklist.txt
dest=/var/www/conf/blacklist.txt
owner=www-data
group=www-data
mode=440
Then deploy whenever you update the list:
$ ansible-playbook blacklist.yml
It's that easy, once you've set it up. And it means you don't need to make costly remote requests from your servers all the time.

Answer 2

here what you can do:
Create one blocked IP file on one of your servers.
e.g filename = blockip.txt
content of blockip.txt:
91.200.14.59,91.207.7.141..
Make sure the file is accessible via http protocol.
e.g: http://www.example.com/blockip.txt
On your application server, create a function which will read blockip.txt file and compare with the remote ip .
e.g:
<?php function check_spam_user($remote_ip){
$x = file_get_content('http://www.example.com/blockip.txt');
if(strpos($x,$remote_ip) === FALSE){
//real user
}
else {
//spammers
}
} ?>
You can use any logic for reading file and comparing ip address.
With this every time you got new IP address you need to update just blockip.txt file, rest all will be taken care by function check_span_user().