Symfony 4 index.php with env data for production

index.php.patch

<?php

use App\Kernel;
use Symfony\Component\Debug\Debug;
use Symfony\Component\Dotenv\Dotenv;
use Symfony\Component\HttpFoundation\Request;

require __DIR__.'/../vendor/autoload.php';

// The check is to ensure we don't use .env in production
if (!isset($_SERVER['APP_ENV'])) {
    if (!class_exists(Dotenv::class)) {
        throw new \RuntimeException('APP_ENV environment variable is not defined. You need to define environment variables for configuration or add "symfony/dotenv" as a Composer dependency to load variables from a .env file.');
    }
-    (new Dotenv())->load(__DIR__.'/../.env');
+
+    $dotEnv = new Dotenv();
+
+    // Directly populate the .env data here but improve it at least a little bit
+    // by not parsing the .env file on every request
+    // Beware, this makes the .env file behave more like a parameters.yml so you
+    // can keep the same structure as you would have in bigger projects with real
+    // environment variables in production but in fact if you wanted to adjust
+    // the .env variables, you need to do both, change the .env file and delete
+    // the .env.php which will then be rewritten on first use.
+    if (!file_exists(__DIR__.'/../.env.php')) {
+        $variables = $dotEnv->parse(file_get_contents(__DIR__.'/../.env'));
+
+        file_put_contents(__DIR__.'/../.env.php', sprintf('<?php return %s;',
+            var_export($variables, true)
+        ));
+
+    } else {
+        $variables = require_once __DIR__.'/../.env.php';
+    }
+
+    $dotEnv->populate($variables);
 }

$env = $_SERVER['APP_ENV'] ?? 'dev';
$debug = $_SERVER['APP_DEBUG'] ?? ('prod' !== $env);

if ($debug) {
    umask(0000);

    Debug::enable();
}

if ($trustedProxies = $_SERVER['TRUSTED_PROXIES'] ?? false) {
    Request::setTrustedProxies(explode(',', $trustedProxies), Request::HEADER_X_FORWARDED_ALL ^ Request::HEADER_X_FORWARDED_HOST);
}

if ($trustedHosts = $_SERVER['TRUSTED_HOSTS'] ?? false) {
    Request::setTrustedHosts(explode(',', $trustedHosts));
}

$kernel = new Kernel($env, $debug);
$request = Request::createFromGlobals();
$response = $kernel->handle($request);
$response->send();
$kernel->terminate($request, $response);