Add test for bug #71236

Author: nikic

ext/spl/tests/bug71236.phpt

@@ -0,0 +1,23 @@
+--TEST--
+Bug #71236: Second call of spl_autoload_register() does nothing if it has no arguments
+--FILE--
+<?php
+
+spl_autoload_register(function ($class) {});
+spl_autoload_register();
+var_dump(spl_autoload_functions());
+
+?>
+--EXPECT--
+array(2) {
+  [0]=>
+  object(Closure)#1 (1) {
+    ["parameter"]=>
+    array(1) {
+      ["$class"]=>
+      string(10) "<required>"
+    }
+  }
+  [1]=>
+  string(12) "spl_autoload"
+}