Merge branch 'PHP-5.6' into PHP-7.0

Zend/tests/bug70681.phpt

@@ -6,6 +6,11 @@ Bug #70681: Segfault when binding $this of internal instance method to null
 $c = (new ReflectionMethod('SplStack', 'count'))->getClosure(new SplStack);
 $c = $c->bindTo(null);
 
+$c = (new ReflectionFunction('strlen'))->getClosure();
+$c = $c->bindTo(null);
+var_dump($c("foo"));
+
 ?>
 --EXPECTF--
 Warning: Cannot unbind $this of internal method in %s on line %d
+int(3)

Zend/zend_closures.c

@@ -174,7 +174,7 @@ ZEND_METHOD(Closure, bind)
 	}
 
 	if (newthis == NULL && !(closure->func.common.fn_flags & ZEND_ACC_STATIC)
-			&& closure->func.type == ZEND_INTERNAL_FUNCTION) {
+			&& closure->func.common.scope && closure->func.type == ZEND_INTERNAL_FUNCTION) {
 		zend_error(E_WARNING, "Cannot unbind $this of internal method");
 		return;
 	}