[FrameworkBundle] Fix TypeError when traversing scalar values in debug:config

Author: yoeunes

Command/ConfigDebugCommand.php

@@ -161,7 +161,7 @@ private function getConfigForPath(array $config, string $path, string $alias): m
         $steps = explode('.', $path);
 
         foreach ($steps as $step) {
-            if (!\array_key_exists($step, $config)) {
+            if (!\is_array($config) || !\array_key_exists($step, $config)) {
                 throw new LogicException(\sprintf('Unable to find configuration for "%s.%s".', $alias, $path));
             }
 

Tests/Functional/ConfigDebugCommandTest.php

@@ -264,6 +264,16 @@ public static function provideCompletionSuggestions(): \Generator
         yield 'option --format, debug' => [true, ['--format', ''], ['yaml', 'json']];
     }
 
+    public function testDumpPathDeepIntoScalar()
+    {
+        $tester = $this->createCommandTester(true);
+
+        $tester->execute(['name' => 'framework', 'path' => 'secret.foo']);
+
+        $this->assertSame(1, $tester->getStatusCode());
+        $this->assertStringContainsString('Unable to find configuration for "framework.secret.foo"', $tester->getDisplay());
+    }
+
     private function createCommandTester(bool $debug): CommandTester
     {
         $command = $this->createApplication($debug)->find('debug:config');