Apache/Nginx为PHP设置、添加$_SERVER服务器环境变量

<code>在PHP开发中为了区分线上生产环境还是本地开发环境，
如果我们能通过判断$_SERVER['RUNTIME_ENVIROMENT']为 'DEV'还是'PRO'来区分该多好，
可惜的是$_SERVER数组里面根本没有RUNTIME_ENVIROMENT这个元素。

</code>

<code>location ~ \.php($|/) {
    try_files         $uri =404;
    fastcgi_pass      unix:/tmp/php-cgi.sock;
    fastcgi_index     index.php;
    include           fastcgi_params;
    fastcgi_param     SCRIPT_FILENAME  $document_root$fastcgi_script_name;
    fastcgi_param     RUNTIME_ENVIROMENT 'PRO'; # PRO or DEV
}</code>

<code>nginx -s reload</code>

<code>env[RUNTIME_ENVIROMENT] = 'PRO'
</code>

<code>service restart php-fpm</code>

<code>SetEnv 变量名 变量值</code>

<code><VirtualHost *:80>
    ServerAdmin webmaster@demo.com
    DocumentRoot "e:\wwwroot\demo"
    ServerName my.demo.com
    ErrorLog "logs/my.demo.com-error.log"
    CustomLog "logs/my.demo.com-access.log" common
    SetEnv RUNTIME_ENVIROMENT DEV

    <Directory "e:\wwwroot\demo">
        Options Indexes FollowSymLinks
        AllowOverride All
        Require all granted
    </Directory>
</VirtualHost></code>

<code>http://man.chinaunix.net/newsoft/ApacheManual/mod/mod_env.html#setenv</code>