Nginx设置$_SERVER变量的方法详解

在有的PHP中定义ENVIRONMENT常量，可以区分开发环境和生产环境，如：

define('ENVIRONMENT', isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] : 'development');
switch (ENVIRONMENT)
{
 case 'development':
  error_reporting(-1);
  ini_set('display_errors', 1);
 break;
 
 case 'testing':
 case 'production':
  ini_set('display_errors', 0);
  if (version_compare(PHP_VERSION, '5.3', '>='))
  {
   error_reporting(E_ALL & ~E_NOTICE & ~E_DEPRECATED & ~E_STRICT & ~E_USER_NOTICE & ~E_USER_DEPRECATED);
  }
  else
  {
   error_reporting(E_ALL & ~E_NOTICE & ~E_STRICT & ~E_USER_NOTICE);
  }
 break;
 
 default:
  header('HTTP/1.1 503 Service Unavailable.', TRUE, 503);
  echo 'The application environment is not set correctly.';
  exit(1); // EXIT_ERROR
}

那么这里的$_SERVER['CI_ENV']如果要定义在哪里定义呢？

Nginx配置设置$_SERVER变量

打开一个nginx的网站配置：

location ~ .php$ {
        try_files      $uri =404;
        root           /usr/share/nginx/html/tanteng.me/public;
        fastcgi_pass   127.0.0.1:9000;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        fastcgi_param  MYENV 'DEV';
        include        fastcgi_params;
}

这里的fastcgi_param MYENV ‘DEV’，就是新加的一行语句。

在PHP中打印$_SERVER看看：

……
  "SERVER_ADDR" => "192.168.10.31"
  "SERVER_NAME" => "www.tanteng.me"
  "SERVER_PORT" => "80"
  "SERVER_SOFTWARE" => "nginx/1.9.11"
  "SERVER_PROTOCOL" => "HTTP/1.1"
  "SERVER_ADMIN" => ""
  "SERVER_SIGNATURE" => ""
  "SCRIPT_NAME" => "/index.php"
  "REDIRECT_STATUS" => "200"
  "REQUEST_URI" => "/test/redis"
  "REMOTE_PORT" => 61290
  "DOCUMENT_URI" => "/index.php"
  "REQUEST_METHOD" => "GET"
  "REMOTE_ADDR" => "192.168.10.1"
  "CONTENT_TYPE" => ""
  "DOCUMENT_ROOT" => "/usr/share/nginx/html/tanteng.me/public"
  "MYENV" => "DEV"
  "CONTENT_LENGTH" => ""
  "QUERY_STRING" => ""
  "SCRIPT_FILENAME" => "/usr/share/nginx/html/tanteng.me/public/index.php"
  "SCRIPT_URL" => "/index.php"
  "SCRIPT_URI" => http://www.111com.net
  "PHP_SELF" => "/index.php"
……

就这样就可以看到多了一个”MYENV”的变量。