[DependencyInjection] Add nice exception when using non-scalar parameter as array key

wouterj · wouterj · commit f5a802ab857e · 2022-07-28T12:03:39.000+02:00
diff --git a/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php b/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
@@ -163,8 +163,13 @@ public function resolveValue(mixed $value, array $resolving = []): mixed
     {
         if (\is_array($value)) {
             $args = [];
-            foreach ($value as $k => $v) {
-                $args[\is_string($k) ? $this->resolveValue($k, $resolving) : $k] = $this->resolveValue($v, $resolving);
+            foreach ($value as $key => $v) {
+                $resolvedKey = \is_string($key) ? $this->resolveValue($key, $resolving) : $key;
+                if (!\is_scalar($resolvedKey) && !$resolvedKey instanceof \Stringable) {
+                    throw new RuntimeException(sprintf('Array keys must be a scalar-value, but found key "%s" to resolve to type "%s".', $key, get_debug_type($resolvedKey)));
+                }
+
+                $args[$resolvedKey] = $this->resolveValue($v, $resolving);
             }
 
             return $args;
