Change how files are included (#7916)

1. `include`, `include_once`, `require` and `require_once` are expressions not functions, parentheses are not necessary.
2. to move up the directory tree, it's better to use the `dirname` function instead of relying on `/..`.

1 files changed, 1 insertions, 1 deletions

diff --git a/index.php b/index.php
index d42135746..910a8faac 100644
--- a/index.php
+++ b/index.php
@@ -2,4 +2,4 @@
 declare(strict_types=1);
 
 header('Location: p/', true, 301);
-include('index.html');
+include 'index.html';