From eae257862c3df9dc8ff55e846c8583d60492e94e Mon Sep 17 00:00:00 2001
From: Lennart Dommer <me@lennart-dommer.de>
Date: Sat, 26 Apr 2025 17:48:01 +0200
Subject: [PATCH 1/2] add append keys with arr helper

---
 src/Illuminate/Collections/Arr.php | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/Illuminate/Collections/Arr.php b/src/Illuminate/Collections/Arr.php
index e4ef759c8f6..7578d0657af 100644
--- a/src/Illuminate/Collections/Arr.php
+++ b/src/Illuminate/Collections/Arr.php
@@ -510,6 +510,18 @@ public static function prependKeysWith($array, $prependWith)
         return static::mapWithKeys($array, fn ($item, $key) => [$prependWith.$key => $item]);
     }
 
+    /**
+     * Append the key names of an associative array.
+     *
+     * @param  array  $array
+     * @param  string  $appendWith
+     * @return array
+     */
+    public static function appendKeysWith($array, $appendWith)
+    {
+        return static::mapWithKeys($array, fn ($item, $key) => [$key.$appendWith => $item]);
+    }
+
     /**
      * Get a subset of the items from the given array.
      *

From 4795b12349f450e8213da92b09d43a6c999a8663 Mon Sep 17 00:00:00 2001
From: Lennart Dommer <me@lennart-dommer.de>
Date: Sat, 26 Apr 2025 21:37:57 +0200
Subject: [PATCH 2/2] add append keys with arr helper test

---
 tests/Support/SupportArrTest.php | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tests/Support/SupportArrTest.php b/tests/Support/SupportArrTest.php
index 85611982475..41dc107aefd 100644
--- a/tests/Support/SupportArrTest.php
+++ b/tests/Support/SupportArrTest.php
@@ -1499,6 +1499,27 @@ public function testPrependKeysWith()
         ], Arr::prependKeysWith($array, 'test.'));
     }
 
+    public function testAppendKeysWith()
+    {
+        $array = [
+            'id' => 1,
+            'name' => 'Lennart',
+            'skills' => ['php', 'mysql', 'laravel'],
+            'meta' => [
+                'prs' => 1,
+            ],
+        ];
+
+        $this->assertEquals([
+            'id_user' => 1,
+            'name_user' => 'Lennart',
+            'skills_user' => ['php', 'mysql', 'laravel'],
+            'meta_user' => [
+                'prs' => 1,
+            ],
+        ], Arr::appendKeysWith($array, appendWith: '_user'));
+    }
+
     public function testTake(): void
     {
         $array = [1, 2, 3, 4, 5, 6];