add test

tests/phpt/dl/1042_to_array_debug_reursion_limit.php

@@ -0,0 +1,33 @@
+@ok
+<?php
+require_once 'kphp_tester_include.php';
+
+class Chain {
+  public ?Chain $next = null;
+}
+
+function test_chain_objects() {
+  $obj = new Chain;
+  $obj->next = new Chain;
+  var_dump(instance_to_array($obj));
+}
+
+function test_max_depth_level() {
+  $obj = new Chain;
+  $ptr = $obj;
+  for ($i = 0; $i < 64; ++$i) {
+    $ptr->next = new Chain;
+    $ptr = $ptr->next;
+  }
+
+  // 64 lvl depth is ok
+  var_dump(count(instance_to_array($obj)));
+
+  $ptr->next = new Chain;
+
+  // allowed depth exceeded
+  var_dump(instance_to_array($obj));
+}
+
+test_chain_objects();
+test_max_depth_level();