[11.x] Add generics for Arr::last() (#53619)

* Removed duplicate lines in existing types test

* PHPStan test: Arr::last

* Fix generics for Arr::last()

* PHPStan types test: Add first and last {array|iterable|traversable}

src/Illuminate/Collections/Arr.php

@@ -216,10 +216,14 @@ public static function first($array, ?callable $callback = null, $default = null
     /**
      * Return the last element in an array passing a given truth test.
      *
-     * @param  array  $array
-     * @param  callable|null  $callback
-     * @param  mixed  $default
-     * @return mixed
+     * @template TKey
+     * @template TValue
+     * @template TLastDefault
+     *
+     * @param  iterable<TKey, TValue>  $array
+     * @param  (callable(TValue, TKey): bool)|null  $callback
+     * @param  TLastDefault|(\Closure(): TLastDefault)  $default
+     * @return TValue|TLastDefault
      */
     public static function last($array, ?callable $callback = null, $default = null)
     {

types/Support/Arr.php

@@ -54,3 +54,48 @@
 assertType('string|User', Arr::first($traversable, null, function () {
     return 'string';
 }));
+
+assertType('User|null', Arr::last($array));
+assertType('User|null', Arr::last($array, function ($user) {
+    assertType('User', $user);
+
+    return true;
+}));
+assertType('string|User', Arr::last($array, function ($user) {
+    assertType('User', $user);
+
+    return false;
+}, 'string'));
+assertType('string|User', Arr::last($array, null, function () {
+    return 'string';
+}));
+
+assertType('User|null', Arr::last($iterable));
+assertType('User|null', Arr::last($iterable, function ($user) {
+    assertType('User', $user);
+
+    return true;
+}));
+assertType('string|User', Arr::last($iterable, function ($user) {
+    assertType('User', $user);
+
+    return false;
+}, 'string'));
+assertType('string|User', Arr::last($iterable, null, function () {
+    return 'string';
+}));
+
+assertType('User|null', Arr::last($traversable));
+assertType('User|null', Arr::last($traversable, function ($user) {
+    assertType('User', $user);
+
+    return true;
+}));
+assertType('string|User', Arr::last($traversable, function ($user) {
+    assertType('User', $user);
+
+    return false;
+}, 'string'));
+assertType('string|User', Arr::last($traversable, null, function () {
+    return 'string';
+}));