diff --git a/docs/book/intro.md b/docs/book/intro.md
index 51e7314..2aaf5ac 100644
--- a/docs/book/intro.md
+++ b/docs/book/intro.md
@@ -46,7 +46,7 @@ Once you have a `MemoryManager` instance, you can start pushing values to it and
 pulling values from it.
 
 ```php
-$loadedFiles = array();
+$loadedFiles = [];
 
 for ($count = 0; $count < 10000; $count++) {
     $f = fopen($fileNames[$count], 'rb');