Update README.md

Author: vladimirok5959

README.md

@@ -1,6 +1,6 @@
 # docker-nginx-php-fpm
 
-Docker image with Nginx + PHP + FPM. PHP version `7.3`. Pre-installed modules: gd, mysql and curl. All env vars located here `/var/www/.env`. Document root directory here `/var/www/html`. All PHP settings defined by default except count of fpm forks, decreased to 1 and the same for Nginx server, `worker_processes` decreased to 1. Time zone can be binded at container startup from host machine by `-v /etc/timezone:/etc/timezone:ro`. Default server port is `80`.
+Docker base image with Nginx + PHP + FPM. PHP version `7.3`. Pre-installed modules: gd, mysql and curl. All env vars located here `/var/www/.env`. Document root directory here `/var/www/html`. All PHP settings defined by default except count of fpm forks, decreased to 1 and the same for Nginx server, `worker_processes` decreased to 1. Time zone can be binded at container startup from host machine by `-v /etc/timezone:/etc/timezone:ro`. Default server port is `80`.
 
 Docker image: [https://hub.docker.com/repository/docker/vladimirok5959/nginx-php-fpm](https://hub.docker.com/repository/docker/vladimirok5959/nginx-php-fpm)
 
@@ -11,3 +11,31 @@ Docker image: [https://hub.docker.com/repository/docker/vladimirok5959/nginx-php
 * **make docker-import** - import docker image from file
 * **make docker-test** - run test container
 * **make docker-push** - push image to docker hub
+
+## Read ENVs from PHP
+
+```php
+function LoadEnvironmentVariables() {
+    $f = '../.env';
+    if(file_exists($f)) {
+        foreach(explode("\n", file_get_contents($f)) as $value) {
+            if(trim($value) != '') {
+                $pos = strpos($value, '=');
+                if($pos === false) continue;
+                $_ENV[substr($value, 0, $pos)] = substr($value, $pos + 1, strlen($value) - $pos - 1);
+            }
+        }
+    }
+}
+```
+
+## Running docker container
+
+```sh
+docker run \
+    --network host \
+    --name my-container-name \
+    -v /etc/timezone:/etc/timezone:ro \
+    -v /path/to/php/files:/var/www/html \
+    -d -it vladimirok5959/nginx-php-fpm:latest
+```