feature symfony#24144 [FrameworkBundle] Expose dotenv in bin/console about (ro0NL)

This PR was merged into the 3.4 branch.

Discussion
----------

[FrameworkBundle] Expose dotenv in bin/console about

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes/no
| Fixed tickets | #... <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!--highly recommended for new features-->

For completeness in CLI, shown in web under "Server parameters".

```php
(new Dotenv())->populate(['APP_ENV' => 'prod', 'APP_DEBUG' => '1']);
```

![image](https://user-images.githubusercontent.com/1047696/30293203-fe360d0a-9738-11e7-80ed-94901cea8898.png)

Commits
-------

9011f47 [FrameworkBundle] Expose dotenv in bin/console about

Author: fabpot

src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md

@@ -59,6 +59,7 @@ CHANGELOG
     and `YamlLintCommand` classes have been marked as final
  * Added `asset.request_context.base_path` and `asset.request_context.secure` parameters
    to provide a default request context in case the stack is empty (similar to `router.request_context.*` parameters)
+ * Display environment variables managed by `Dotenv` in `AboutCommand`
 
 3.3.0
 -----

src/Symfony/Bundle/FrameworkBundle/Command/AboutCommand.php

@@ -35,7 +35,19 @@ class AboutCommand extends ContainerAwareCommand
      */
     protected function configure()
     {
-        $this->setDescription('Displays information about the current project');
+        $this
+            ->setDescription('Displays information about the current project')
+            ->setHelp(<<<'EOT'
+The <info>%command.name%</info> command displays information about the current Symfony project.
+
+The <info>PHP</info> section displays important configuration that could affect your application. The values might
+be different between web and CLI.
+
+The <info>Environment</info> section displays the current environment variables managed by Symfony Dotenv. It will not
+be shown if no variables were found. The values might be different between web and CLI.
+EOT
+            )
+        ;
     }
 
     /**
@@ -48,7 +60,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         /** @var $kernel KernelInterface */
         $kernel = $this->getApplication()->getKernel();
 
-        $io->table(array(), array(
+        $rows = array(
             array('<info>Symfony</>'),
             new TableSeparator(),
             array('Version', Kernel::VERSION),
@@ -75,7 +87,19 @@ protected function execute(InputInterface $input, OutputInterface $output)
             array('OPcache', extension_loaded('Zend OPcache') && ini_get('opcache.enable') ? 'true' : 'false'),
             array('APCu', extension_loaded('apcu') && ini_get('apc.enabled') ? 'true' : 'false'),
             array('Xdebug', extension_loaded('xdebug') ? 'true' : 'false'),
-        ));
+        );
+
+        if ($dotenv = self::getDotEnvVars()) {
+            $rows = array_merge($rows, array(
+                new TableSeparator(),
+                array('<info>Environment (.env)</>'),
+                new TableSeparator(),
+            ), array_map(function ($value, $name) {
+                return array($name, $value);
+            }, $dotenv, array_keys($dotenv)));
+        }
+
+        $io->table(array(), $rows);
     }
 
     private static function formatPath($path, $baseDir = null)
@@ -103,4 +127,16 @@ private static function isExpired($date)
 
         return false !== $date && new \DateTime() > $date->modify('last day of this month 23:59:59');
     }
+
+    private static function getDotEnvVars()
+    {
+        $vars = array();
+        foreach (explode(',', getenv('SYMFONY_DOTENV_VARS')) as $name) {
+            if ('' !== $name && false !== $value = getenv($name)) {
+                $vars[$name] = $value;
+            }
+        }
+
+        return $vars;
+    }
 }