Fix bug in zend_test assuming null not being the first type

(I agree that null should come last, but then it should rather throw with a proper message than emit an undefined key warning.)

Signed-off-by: Bob Weinand <bobwei9@hotmail.com>

Author: bwoebi

build/gen_stub.php

@@ -650,11 +650,13 @@ public function isNullable(): bool {
 
     public function getWithoutNull(): Type {
         return new Type(
-            array_filter(
-                $this->types,
-                function(SimpleType $type) {
-                    return !$type->isNull();
-                }
+            array_values(
+                array_filter(
+                    $this->types,
+                    function(SimpleType $type) {
+                        return !$type->isNull();
+                    }
+                )
             ),
             false
         );

ext/zend_test/test.stub.php

@@ -119,7 +119,7 @@ enum ZendTestIntEnum: int {
 
     function zend_test_array_return(): array {}
 
-    function zend_test_nullable_array_return(): ?array {}
+    function zend_test_nullable_array_return(): null|array {}
 
     function zend_test_void_return(): void {}