diff --git a/src/Command/DumpEnvCommand.php b/src/Command/DumpEnvCommand.php
index da1bb0c8c..83db3190d 100644
--- a/src/Command/DumpEnvCommand.php
+++ b/src/Command/DumpEnvCommand.php
@@ -17,7 +17,7 @@
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Dotenv\Dotenv;
+use Symfony\Component\Process\PhpProcess;
 use Symfony\Flex\Options;
 
 class DumpEnvCommand extends BaseCommand
@@ -50,12 +50,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $_SERVER['APP_ENV'] = $env = $input->getArgument('env');
         $path = $this->options->get('root-dir').'/.env';
 
-        if (!$input->getOption('empty')) {
-            $this->loadEnv($path, $env);
-        }
-
-        $vars = array_flip(explode(',', ($_SERVER['SYMFONY_DOTENV_VARS'] ?? '').',APP_ENV'));
-        $vars = array_intersect_key($_SERVER, $vars);
+        $vars = $input->getOption('empty') ? ['APP_ENV' => $env] : $this->loadEnv($path, $env);
         $vars = var_export($vars, true);
         $vars = <<<EOF
 <?php
@@ -70,33 +65,75 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $this->getIO()->writeError('Successfully dumped .env files in <info>.env.local.php</>');
     }
 
-    private function loadEnv(string $path, string $env)
+    private function loadEnv(string $path, string $env): array
     {
-        require $this->config->get('vendor-dir').'/autoload.php';
-
-        if (!class_exists(Dotenv::class)) {
-            throw new \RuntimeException('Please run "composer require symfony/dotenv" to load the ".env" files configuring the application.');
+        if (!file_exists($autoloadFile = $this->config->get('vendor-dir').'/autoload.php')) {
+            throw new \RuntimeException(sprintf('Please run "composer install" before running this command: "%s" not found.', $autoloadFile));
         }
 
-        $dotenv = new Dotenv();
+        $php = <<<'EOPHP'
+<?php
 
-        if (method_exists($dotenv, 'loadEnv')) {
-            $dotenv->loadEnv($path);
-        } else {
-            // fallback code in case your Dotenv component is not 4.2 or higher (when loadEnv() was added)
-            $dotenv->load(file_exists($path) || !file_exists($p = "$path.dist") ? $path : $p);
+use Symfony\Component\Dotenv\Dotenv;
 
-            if ('test' !== $env && file_exists($p = "$path.local")) {
-                $dotenv->load($p);
-            }
+require %s;
 
-            if (file_exists($p = "$path.$env")) {
-                $dotenv->load($p);
-            }
+if (!class_exists(Dotenv::class)) {
+    exit;
+}
+
+foreach ($_SERVER as $k => $v) {
+    if (\is_string($v) && false !== getenv($k)) {
+        unset($_SERVER[$k]);
+        putenv($k);
+    }
+}
+
+$path = %s;
+$env = %s;
+$dotenv = new Dotenv();
+$_ENV = ['APP_ENV' => $env];
+
+if (method_exists($dotenv, 'loadEnv')) {
+    $dotenv->loadEnv($path);
+} else {
+    // fallback code in case your Dotenv component is not 4.2 or higher (when loadEnv() was added)
+    $dotenv->load(file_exists($path) || !file_exists($p = "$path.dist") ? $path : $p);
+
+    if ('test' !== $env && file_exists($p = "$path.local")) {
+        $dotenv->load($p);
+    }
 
-            if (file_exists($p = "$path.$env.local")) {
-                $dotenv->load($p);
-            }
+    if (file_exists($p = "$path.$env")) {
+        $dotenv->load($p);
+    }
+
+    if (file_exists($p = "$path.$env.local")) {
+        $dotenv->load($p);
+    }
+}
+
+unset($_ENV['SYMFONY_DOTENV_VARS']);
+
+echo serialize($_ENV);
+
+EOPHP;
+
+        $php = sprintf($php, var_export($autoloadFile, true), var_export($path, true), var_export($env, true));
+        $process = new PhpProcess($php);
+        if (method_exists($process, 'inheritEnvironmentVariables')) {
+            $process->inheritEnvironmentVariables();
+        }
+        $process->run();
+
+        if (!$process->isSuccessful()) {
+            throw new \RuntimeException($process->getErrorOutput());
         }
+
+        if (!$env = $process->getOutput()) {
+            throw new \RuntimeException('Please run "composer require symfony/dotenv" to load the ".env" files configuring the application.');
+        }
+
+        return unserialize($env);
     }
 }