title: Separate PHP error logs and system logs with nginx for each virtualhost
body: <p>How can I set up NGINX to log separately system error and PHP error messages for every virtual host. 
  Somehow I should overwrite the global php.ini error_log value for each virtual host.
  What I found:</p>
  
  <pre><code>    server {
         server_name some-server.com;
         access_log /var/log/nginx/some-server.access.log;
         error_log /var/log/nginx/some-server.error.log info;
         root /var/websites/some-server/;
         fastcgi_param PHP_VALUE "error_log=\"/var/log/nginx/some-server.php-error.log\"";
      }
  </code></pre>
  
  <p>However file parmissions are OK, this solution is not working!</p>