Ensure that an empty array cannot be provided as a set of headers

PSR-7 requires a string or array of strings; if an array is provided, it cannot be empty.
zendframework · Sep 5, 2018 · ee4bcdc · ee4bcdc
1 parent 6328ae3
commit ee4bcdc
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/src/MessageTrait.php b/src/MessageTrait.php
@@ -385,6 +385,13 @@ private function filterHeaderValue($values)
             $values = [$values];
         }
 
+        if ([] === $values) {
+            throw new InvalidArgumentException(
+                'Invalid header value: must be a string or array of strings; '
+                . 'cannot be an empty array'
+            );
+        }
+
         return array_map(function ($value) {
             HeaderSecurity::assertValid($value);