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/lib/http-conditional.php b/lib/http-conditional.php
index c08f72f75..e56732354 100644
--- a/lib/http-conditional.php
+++ b/lib/http-conditional.php
@@ -16,7 +16,7 @@ declare(strict_types=1);
 
 ```php
 <?php
-	require_once('http-conditional.php');
+	require_once 'http-conditional.php';
 	//Date of the last modification of the content (Unix Timestamp format).
 	//Examples: query the database, or last modification of a static file.
 	$dateLastModification = ...;