bug #34301 [DI] fix loading env while env loaders are loaded (nicolas…

…-grekas)

This PR was merged into the 4.4 branch.

Discussion
----------

[DI] fix loading env while env loaders are loaded

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

Commits
-------

522bd5d [DI] fix loading env while env loaders are loaded

src/Symfony/Component/DependencyInjection/EnvVarProcessor.php

@@ -141,15 +141,20 @@ public function getEnv($prefix, $name, \Closure $getEnv)
                 }
             }
 
+            $loaders = $this->loaders;
+            $this->loaders = new \ArrayIterator();
+
             try {
-                while ((false === $env || null === $env) && $this->loaders->valid()) {
-                    $loader = $this->loaders->current();
-                    $this->loaders->next();
+                while ((false === $env || null === $env) && $loaders->valid()) {
+                    $loader = $loaders->current();
+                    $loaders->next();
                     $this->loadedVars[] = $vars = $loader->loadEnvVars();
                     $env = $vars[$name] ?? false;
                 }
             } catch (ParameterCircularReferenceException $e) {
                 // skip loaders that need an env var that is not defined
+            } finally {
+                $this->loaders = $loaders;
             }
 
             if (false === $env || null === $env) {