Fix implicitly nullable parameters for PHP 8.4 (#35)

* Fix implicitly nullable parameters for PHP 8.4

* Add 8.4 to test matrix

Author: tylersatre

.github/workflows/tests.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [7.2, 7.3, 7.4, '8.0', 8.1, 8.2, 8.3]
+        php: [7.2, 7.3, 7.4, '8.0', 8.1, 8.2, 8.3, 8.4]
 
     name: PHP ${{ matrix.php }}
 

src/helpers.php

@@ -81,7 +81,7 @@ function array_except($array, $keys)
      * @param  mixed  $default
      * @return mixed
      */
-    function array_first($array, callable $callback = null, $default = null)
+    function array_first($array, ?callable $callback = null, $default = null)
     {
         return Arr::first($array, $callback, $default);
     }
@@ -153,7 +153,7 @@ function array_has($array, $keys)
      * @param  mixed  $default
      * @return mixed
      */
-    function array_last($array, callable $callback = null, $default = null)
+    function array_last($array, ?callable $callback = null, $default = null)
     {
         return Arr::last($array, $callback, $default);
     }