diff --git a/src/Support/sortByMany.php b/src/Support/sortByMany.php
index 1e437b3..cebade1 100644
--- a/src/Support/sortByMany.php
+++ b/src/Support/sortByMany.php
@@ -9,7 +9,9 @@ function sortByMany(array $items, array $comparisons): array
             $comparison = normalize($comparison);
             $prop = $comparison[0] ?? null;
             $direction = strtolower((string) ($comparison[1] ?? 'asc'));
-            $result = dataGet($a, $prop) <=> dataGet($b, $prop);
+            $result = (! is_string($prop) && is_callable($prop))
+                ? $prop($a, $b)
+                : dataGet($a, $prop) <=> dataGet($b, $prop);
 
             if ($result !== 0) {
                 return $direction === 'desc' ? -$result : $result;
diff --git a/tests/Arr/SortByFnTest.php b/tests/Arr/SortByFnTest.php
new file mode 100644
index 0000000..94d46dd
--- /dev/null
+++ b/tests/Arr/SortByFnTest.php
@@ -0,0 +1,20 @@
+<?php
+
+use function Spatie\Piper\Arr\sortBy;
+
+it('sorts values ascending while preserving keys', function () {
+    expect([
+        ['name' => 'Aaron', 'score' => 43],
+        ['name' => 'Sophie', 'score' => 87],
+        ['name' => 'Aaron', 'score' => 59],
+        ['name' => 'Sophie', 'score' => 62],
+    ] |> sortBy([
+        fn (array $a, array $b) => $a['name'] <=> $b['name'],
+        fn (array $a, array $b) => $b['score'] <=> $a['score'],
+    ]))->toBe([
+        2 => ['name' => 'Aaron', 'score' => 59],
+        0 => ['name' => 'Aaron', 'score' => 43],
+        1 => ['name' => 'Sophie', 'score' => 87],
+        3 => ['name' => 'Sophie', 'score' => 62],
+    ]);
+});