php - nginx change root on specific url -

i have 1 nginx http server configuration 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 address http://test.loc/sample root in folder /var/www/test2 no matter how tried, displays contents of /var/www/test.

thank in advance.

upd:

now have 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, when content of url http://test.loc/sample/ see content /var/www/test2/sample/index.php.
displayed /var/www/test2/index.php

any ideas? thanks.