http://exbb.info/community/loginout.php
с параметрами
action=login&imembername=*&ipassword=?&submit=%C2%F5%EE%E4
где
* - логин пользователя
? - пароль пользователя

$string = preg_replace_callback(
"#\[img\]\s*((http://|www\.)[A-Za-z0-9-_\./\?\%\&\+\;\,\)\(~=]+?)\s*\[/img\]#is",

create_function( '$matches',
'global $fm;
$matches[1] = ($matches[2] === "www.") ?
"http://".$matches[1]
: $matches[1];
return ($fm->exbb[\'imgpreview\'] === TRUE) ?
replace_img_link($matches[1])
: "<img src=\"".$matches[1]."\"> ";'
),

$string
);

[img]http://joinfo.ua/images/news/2015/01/54ccff59a1a79_1398_54bf595f25a77_cr(3).jpg[/img]
[img=http://joinfo.ua/images/news/2015/01/54ccff59a1a79_1398_54bf595f25a77_cr(3).jpg][/img][img=http://joinfo.ua/images/news/2015/01/54ccff59a1a79%5f1398%5f54bf595f25a77%5fcr%283%29.jpg][/img]

[img]http://joinfo.ua/images/news/2015/01/54ccff59a1bc4_YAR_3_cr.jpg[/img]

user www;
worker_processes 2;
pid /var/run/nginx.pid;

events {
use kqueue;
worker_connections 1024;
multi_accept on;
}
http {
include mime.types;
default_type application/octet-stream;
large_client_header_buffers 4 4k;
tcp_nopush on;
sendfile on;
output_buffers 32 512k;
sendfile_max_chunk 128k;
postpone_output 1460;
tcp_nodelay on;
limit_zone lconn $binary_remote_addr 5m;
fastcgi_intercept_errors on;
server_names_hash_bucket_size 64;
client_max_body_size 15m;
server {
listen IP_своего_веб_сервера;
server_name DNS_имя_своего_веб_сервера;
limit_conn lconn 5;
location / {
root /usr/local/www/папка_с_содержимым_сайта;
index index.html index.htm;
}
}
}