nginx change root on specific url - php

Question

I have one nginx http server configuration like this:
server {
listen 80;
server_name test.loc;
root /var/www/test;
location ~ \.php {
fastcgi_split_path_info ^(.+\.php)(.+)$;
set $fsn /index.php;
if (-f $document_root$fastcgi_script_name){
set $fsn $fastcgi_script_name;
}
fastcgi_pass 127.0.0.1:9000;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fsn;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_param PATH_TRANSLATED $document_root$fsn;
fastcgi_read_timeout 180;
}
location / {
index index.html index.php;
try_files $uri $uri/ /index.php?$args;
}
location /sample/ {
root /var/www/test2/;
}
}
I want to address http://test.loc/sample root was in the folder /var/www/test2 but no matter how I tried, displays the contents of /var/www/test.
Thank you in advance.
UPD:
now i have this config:
server {
listen 80;
server_name test.loc;
root /var/www/test;
error_log /var/log/nginx/mytest.log;
index index.html index.php;
location / {
index index.html index.php;
try_files $uri $uri/ /index.php?$args;
set $root /var/www/test;
}
location /sample {
index index.html index.php;
try_files $uri $uri/ /index.php?$args;
alias /var/www/test2;
location ~ \.php$ {
include fastcgi_params;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_index index.php;
fastcgi_param PATH_TRANSLATED $document_root$fastcgi_script_name;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_pass 127.0.0.1:9000;
}
}
location ~ \.php$ {
#try_files $uri =404;
#fastcgi_split_path_info ^(.+\.php)(/.+)$;
#fastcgi_split_path_info ^(.+\.php)(.+)$;
include fastcgi_params;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_index index.php;
fastcgi_param PATH_TRANSLATED $document_root$fastcgi_script_name;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_pass 127.0.0.1:9000;
}
}
all works fine, but when i get content of this url http://test.loc/sample/ i see content /var/www/test2/sample/index.php.
I would like to be displayed /var/www/test2/index.php
Any ideas? Thanks.