diff --git a/src/Symfony/Component/Dotenv/Command/DebugCommand.php b/src/Symfony/Component/Dotenv/Command/DebugCommand.php
index 8ceb1fd48484..0585043cd946 100644
--- a/src/Symfony/Component/Dotenv/Command/DebugCommand.php
+++ b/src/Symfony/Component/Dotenv/Command/DebugCommand.php
@@ -82,7 +82,13 @@ protected function execute(InputInterface $input, OutputInterface $output): int
private function getVariables(array $envFiles): array
{
- $vars = explode(',', $_SERVER['SYMFONY_DOTENV_VARS'] ?? '');
+ $dotenvVars = $_SERVER['SYMFONY_DOTENV_VARS'] ?? '';
+
+ if ('' === $dotenvVars) {
+ return [];
+ }
+
+ $vars = explode(',', $dotenvVars);
sort($vars);
$output = [];
diff --git a/src/Symfony/Component/Dotenv/Tests/Command/DebugCommandTest.php b/src/Symfony/Component/Dotenv/Tests/Command/DebugCommandTest.php
index b3b089e4559c..b8b7e3900860 100644
--- a/src/Symfony/Component/Dotenv/Tests/Command/DebugCommandTest.php
+++ b/src/Symfony/Component/Dotenv/Tests/Command/DebugCommandTest.php
@@ -25,6 +25,8 @@ class DebugCommandTest extends TestCase
*/
public function testErrorOnUninitializedDotenv()
{
+ unset($_SERVER['SYMFONY_DOTENV_VARS']);
+
$command = new DebugCommand('dev', __DIR__.'/Fixtures/Scenario1');
$command->setHelperSet(new HelperSet([new FormatterHelper()]));
$tester = new CommandTester($command);
@@ -34,6 +36,30 @@ public function testErrorOnUninitializedDotenv()
$this->assertStringContainsString('[ERROR] Dotenv component is not initialized', $output);
}
+ /**
+ * @runInSeparateProcess
+ */
+ public function testEmptyDotEnvVarsList()
+ {
+ $_SERVER['SYMFONY_DOTENV_VARS'] = '';
+
+ $command = new DebugCommand('dev', __DIR__.'/Fixtures/Scenario1');
+ $command->setHelperSet(new HelperSet([new FormatterHelper()]));
+ $tester = new CommandTester($command);
+ $tester->execute([]);
+ $expectedFormat = <<<'OUTPUT'
+%a
+ ---------- ------- ------------ ------%S
+ Variable Value .env.local .env%S
+ ---------- ------- ------------ ------%S
+
+ // Note real values might be different between web and CLI.%S
+%a
+OUTPUT;
+
+ $this->assertStringMatchesFormat($expectedFormat, $tester->getDisplay());
+ }
+
public function testScenario1InDevEnv()
{
$output = $this->executeCommand(__DIR__.'/Fixtures/Scenario1', 'dev');
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