Add notes on setting env variables from server configs

Author: samdark

cookbook/en/configuring-webservers/apache.md

@@ -20,6 +20,8 @@ DocumentRoot "path/to/app/public"
     
     # Otherwise forward the request to index.php
     RewriteRule . index.php
+    
+    SetEnv APP_ENV dev
 
     # ...other settings...
 </Directory>
@@ -42,5 +44,10 @@ RewriteCond %{REQUEST_FILENAME} !-d
 # Otherwise forward the request to index.php
 RewriteRule . index.php
 
+SetEnv APP_ENV dev
+
 # ...other settings...
 ```
+
+In the above note usage of `SetEnv`. Since the Yii3 application template is using environment variables, this is a possible
+place to set them. In production environment remember to set `APP_ENV` to `prod`.

cookbook/en/configuring-webservers/iis.md

@@ -8,23 +8,23 @@ Use the following content:
 ```xml
 <?xml version="1.0" encoding="UTF-8"?>
 <configuration>
-<system.webServer>
-<directoryBrowse enabled="false" />
-  <rewrite>
-    <rules>
-      <rule name="Hide Yii Index" stopProcessing="true">
-        <match url="." ignoreCase="false" />
-        <conditions>
-        <add input="{REQUEST_FILENAME}" matchType="IsFile" 
-              ignoreCase="false" negate="true" />
-        <add input="{REQUEST_FILENAME}" matchType="IsDirectory" 
-              ignoreCase="false" negate="true" />
-        </conditions>
-        <action type="Rewrite" url="index.php" appendQueryString="true" />
-      </rule> 
-    </rules>
-  </rewrite>
-</system.webServer>
+    <system.webServer>
+        <directoryBrowse enabled="false" />
+        <rewrite>
+            <rules>
+                <rule name="Hide Yii Index" stopProcessing="true">
+                    <match url="." ignoreCase="false" />
+                    <conditions>
+                        <add input="{REQUEST_FILENAME}" matchType="IsFile" 
+                            ignoreCase="false" negate="true" />
+                        <add input="{REQUEST_FILENAME}" matchType="IsDirectory" 
+                            ignoreCase="false" negate="true" />
+                    </conditions>
+                    <action type="Rewrite" url="index.php" appendQueryString="true" />
+                </rule> 
+            </rules>
+      </rewrite>
+    </system.webServer>
 </configuration>
 ```
 

cookbook/en/configuring-webservers/nginx-unit.md

@@ -41,6 +41,9 @@ Here is a sample configuration.
         "yii": {
             "type": "php",
             "user": "www-data",
+            "environment": {
+                "APP_ENV": "dev"
+            },
             "targets": {
                 "direct": {
                     "root": "/path/to/app/public/"
@@ -58,3 +61,6 @@ Here is a sample configuration.
 
 You can also [set up](https://unit.nginx.org/configuration/#php) your PHP environment or supply a custom `php.ini`
 in the same configuration.
+
+In the above note usage of `environment`. Since the Yii3 application template is using environment variables,
+this is a possible place to set them. In production environment remember to set `APP_ENV` to `prod`.

cookbook/en/configuring-webservers/nginx.md

@@ -41,6 +41,7 @@ server {
         fastcgi_pass 127.0.0.1:9000;
         #fastcgi_pass unix:/var/run/php8-fpm.sock;
         try_files $uri =404;
+        fastcgi_param APP_ENV "dev";
     }
 
     location ~* /\. {
@@ -54,3 +55,6 @@ to avoid many unnecessary system `stat()` calls.
 
 Also, note that when running an HTTPS server, you need to add `fastcgi_param HTTPS on;` so that Yii
 can detect if a connection is secure.
+
+In the above note usage of `fastcgi_param APP_ENV`. Since the Yii3 application template is using environment variables,
+this is a possible place to set them. In production environment remember to set `APP_ENV` to `prod`.