Apache/Nginx set up and add $_SERVER server environment variable for PHP

Requirements

<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>

1. Set it through nginx’s fastcgi_param

In the nginx configuration file, it can be set in the nginx overall configuration file nginx.conf, or in a separate website configuration environment, such as: www.tomener .com.conf

Add the corresponding configuration information in the configuration environment server section location:

<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>

Only the fastcgi_param RUNTIME_ENVIROMENT 'PRO' value is added here, more can be added later

Then restart nginx

<code>nginx -s reload</code>

2 , set through the main php configuration file php-fpm.conf

This setting must be placed in the main configuration file php-fpm.conf and cannot be placed in the sub-configuration file set by the include directive, otherwise an error will be reported: "Array are not allowed in the global section"

My php-fpm.conf location is in /usr/local/php/etc/php-fpm.conf

Add it directly in the configuration file:

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

Restart php-fpm after adding it

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

After adding the $_SERVER variable value through the above two methods, we can directly obtain the corresponding variable value through $_SERVER in the php file.

However, it is said that if the configuration information is set through nginx's fastcgi_param, when nginx interacts with php, a large amount of data will be transmitted.

Apache sets environment variables

<code>SetEnv 变量名 变量值</code>

<code><virtualhost>
    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>
        Options Indexes FollowSymLinks
        AllowOverride All
        Require all granted
    </directory>
</virtualhost></code>

Reference documentation:

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

The above introduces how to set and add the $_SERVER server environment variable for PHP by Apache/Nginx, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.