From f755ac102af2205abcf8e0a4632a663378a576b2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Wed, 29 Oct 2025 17:57:55 +0100
Subject: [PATCH 01/13] use `ReplacesAttributes::replaceKeepCase()` also for
 imploded parameters

---
 .../Concerns/ReplacesAttributes.php           | 84 +++++++------------
 1 file changed, 32 insertions(+), 52 deletions(-)

diff --git a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
index abd5ba154a5c..d55210930e7b 100644
--- a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
@@ -241,14 +241,10 @@ protected function replaceMissingUnless($message, $attribute, $rule, $parameters
      */
     protected function replaceMissingWith($message, $attribute, $rule, $parameters)
     {
-        return str_replace(
-            [':values', ':VALUES', ':Values'],
-            [
-                implode(' / ', $this->getAttributeList($parameters)),
-                Str::upper(implode(' / ', $this->getAttributeList($parameters))),
-                implode(' / ', array_map(Str::ucfirst(...), $this->getAttributeList($parameters))),
-            ],
-            $message
+        return $this->replaceKeepCase(
+            $message,
+            ['values' => $this->getAttributeList($parameters)],
+            ['values' => ' / '],
         );
     }
 
@@ -295,14 +291,10 @@ protected function replaceIn($message, $attribute, $rule, $parameters)
             $parameter = $this->getDisplayableValue($attribute, $parameter);
         }
 
-        return str_replace(
-            [':values', ':VALUES', ':Values'],
-            [
-                implode(', ', $parameters),
-                Str::upper(implode(', ', $parameters)),
-                implode(', ', array_map(Str::ucfirst(...), $parameters)),
-            ],
+        return $this->replaceKeepCase(
             $message,
+            ['values' => $this->getAttributeList($parameters)],
+            ['values' => ', '],
         );
     }
 
@@ -431,14 +423,10 @@ protected function replacePresentUnless($message, $attribute, $rule, $parameters
      */
     protected function replacePresentWith($message, $attribute, $rule, $parameters)
     {
-        return str_replace(
-            [':values', ':VALUES', ':Values'],
-            [
-                implode(' / ', $this->getAttributeList($parameters)),
-                Str::upper(implode(' / ', $this->getAttributeList($parameters))),
-                implode(' / ', array_map(Str::ucfirst(...), $this->getAttributeList($parameters))),
-            ],
+        return $this->replaceKeepCase(
             $message,
+            ['values' => $this->getAttributeList($parameters)],
+            ['values' => ' / '],
         );
     }
 
@@ -467,14 +455,10 @@ protected function replacePresentWithAll($message, $attribute, $rule, $parameter
      */
     protected function replaceRequiredWith($message, $attribute, $rule, $parameters)
     {
-        return str_replace(
-            [':values', ':VALUES', ':Values'],
-            [
-                implode(' / ', $this->getAttributeList($parameters)),
-                Str::upper(implode(' / ', $this->getAttributeList($parameters))),
-                implode(' / ', array_map(Str::ucfirst(...), $this->getAttributeList($parameters))),
-            ],
+        return $this->replaceKeepCase(
             $message,
+            ['values' => $this->getAttributeList($parameters)],
+            ['values' => ' / '],
         );
     }
 
@@ -657,17 +641,10 @@ protected function replaceRequiredUnless($message, $attribute, $rule, $parameter
             $values[] = $this->getDisplayableValue($parameters[0], $value);
         }
 
-        return str_replace(
-            [':other', ':OTHER', ':Other', ':values', ':VALUES', ':Values'],
-            [
-                $other,
-                Str::upper($other),
-                Str::ucfirst($other),
-                implode(', ', $values),
-                Str::upper(implode(', ', $values)),
-                implode(', ', array_map(Str::ucfirst(...), $values)),
-            ],
-            $message
+        return $this->replaceKeepCase(
+            $message,
+            ['other' => $other, 'values' => $values],
+            ['values' => ', '],
         );
     }
 
@@ -738,14 +715,10 @@ protected function replaceProhibitedUnless($message, $attribute, $rule, $paramet
      */
     protected function replaceProhibits($message, $attribute, $rule, $parameters)
     {
-        return str_replace(
-            [':other', ':OTHER', ':Other'],
-            [
-                implode(' / ', $this->getAttributeList($parameters)),
-                Str::upper(implode(' / ', $this->getAttributeList($parameters))),
-                implode(' / ', array_map(Str::ucfirst(...), $this->getAttributeList($parameters))),
-            ],
-            $message
+        return $this->replaceKeepCase(
+            $message,
+            ['other' => $this->getAttributeList($parameters)],
+            ['other' => ' / '],
         );
     }
 
@@ -938,17 +911,24 @@ protected function replaceDoesntContain($message, $attribute, $rule, $parameters
      */
     private function replaceWhileKeepingCase(string $message, array $mapping): string
     {
-        $fn = [Str::lower(...), Str::upper(...), Str::ucfirst(...)];
+        $fn = [
+           Str::lower(...),
+           Str::upper(...),
+           //fn (string $placeholder, ?string $parameter = null) => ucwords($parameter ?? $placeholder, $parameter !== null ? ($wordSeparators[$placeholder] ?? ' ') : ' '),
+           fn (string $placeholder, ?string $parameter = null) => $parameter !== null && array_key_exists($placeholder, $wordSeparators)
+               ? ucwords($parameter ?? $placeholder, $wordSeparators[$placeholder])
+               : ucfirst($parameter ?? $placeholder),
+        ];
 
         $cases = array_reduce(
             array_keys($mapping),
-            fn (array $carry, string $placeholder) => [...$carry, ...array_map(fn (callable $fn) => ':'.$fn($placeholder), $fn)],
+            fn (array $carry, string $placeholder) => [...$carry, ...array_map(fn (callable $fn) => ':' . $fn($placeholder), $fn)],
             [],
         );
 
         $replacements = array_reduce(
-            array_values($mapping),
-            fn (array $carry, string $parameter) => [...$carry, ...array_map(fn (callable $fn) => $fn($parameter), $fn)],
+            array_keys($mapping),
+            fn (array $carry, string $placeholder) => [...$carry, ...array_map(fn (callable $fn) => $fn($placeholder, $mapping[$placeholder]), $fn)],
             [],
         );
 

From a44d1ddd27e5cdd3799facf2a1604b0d7323da2e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Wed, 29 Oct 2025 18:02:36 +0100
Subject: [PATCH 02/13] StyleCI

---
 .../Validation/Concerns/ReplacesAttributes.php     | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
index d55210930e7b..4e14ea2f1d7f 100644
--- a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
@@ -912,17 +912,17 @@ protected function replaceDoesntContain($message, $attribute, $rule, $parameters
     private function replaceWhileKeepingCase(string $message, array $mapping): string
     {
         $fn = [
-           Str::lower(...),
-           Str::upper(...),
-           //fn (string $placeholder, ?string $parameter = null) => ucwords($parameter ?? $placeholder, $parameter !== null ? ($wordSeparators[$placeholder] ?? ' ') : ' '),
-           fn (string $placeholder, ?string $parameter = null) => $parameter !== null && array_key_exists($placeholder, $wordSeparators)
-               ? ucwords($parameter ?? $placeholder, $wordSeparators[$placeholder])
-               : ucfirst($parameter ?? $placeholder),
+            Str::lower(...),
+            Str::upper(...),
+            //fn (string $placeholder, ?string $parameter = null) => ucwords($parameter ?? $placeholder, $parameter !== null ? ($wordSeparators[$placeholder] ?? ' ') : ' '),
+            fn (string $placeholder, ?string $parameter = null) => $parameter !== null && array_key_exists($placeholder, $wordSeparators)
+                ? ucwords($parameter ?? $placeholder, $wordSeparators[$placeholder])
+                : ucfirst($parameter ?? $placeholder),
         ];
 
         $cases = array_reduce(
             array_keys($mapping),
-            fn (array $carry, string $placeholder) => [...$carry, ...array_map(fn (callable $fn) => ':' . $fn($placeholder), $fn)],
+            fn (array $carry, string $placeholder) => [...$carry, ...array_map(fn (callable $fn) => ':'.$fn($placeholder), $fn)],
             [],
         );
 

From 307208518774996025675b02860f895cb4289c27 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Wed, 29 Oct 2025 18:08:40 +0100
Subject: [PATCH 03/13] Fix static analysis
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

– Add missing method arguments
– Remove duplicated condition
---
 src/Illuminate/Validation/Concerns/ReplacesAttributes.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
index 4e14ea2f1d7f..1ff3f1bf02a1 100644
--- a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
@@ -908,15 +908,16 @@ protected function replaceDoesntContain($message, $attribute, $rule, $parameters
      * Replace the given string while maintaining different casing variants.
      *
      * @param  array<string, string>  $mapping
+     * @param  array<string, string>  $wordSeparators
      */
-    private function replaceWhileKeepingCase(string $message, array $mapping): string
+    private function replaceWhileKeepingCase(string $message, array $mapping, $wordSeparators = []): string
     {
         $fn = [
             Str::lower(...),
             Str::upper(...),
             //fn (string $placeholder, ?string $parameter = null) => ucwords($parameter ?? $placeholder, $parameter !== null ? ($wordSeparators[$placeholder] ?? ' ') : ' '),
             fn (string $placeholder, ?string $parameter = null) => $parameter !== null && array_key_exists($placeholder, $wordSeparators)
-                ? ucwords($parameter ?? $placeholder, $wordSeparators[$placeholder])
+                ? ucwords($parameter, $wordSeparators[$placeholder])
                 : ucfirst($parameter ?? $placeholder),
         ];
 

From 886713bde188f54a902d57fd6d6b9cbc590d62ad Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Wed, 29 Oct 2025 18:17:12 +0100
Subject: [PATCH 04/13] Update method name in call

to align with the changes made in 78861ff9756e2bf31fbe4efed08293a2f237e040
---
 .../Validation/Concerns/ReplacesAttributes.php       | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
index 1ff3f1bf02a1..cffa38762c0b 100644
--- a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
@@ -241,7 +241,7 @@ protected function replaceMissingUnless($message, $attribute, $rule, $parameters
      */
     protected function replaceMissingWith($message, $attribute, $rule, $parameters)
     {
-        return $this->replaceKeepCase(
+        return $this->replaceWhileKeepingCase(
             $message,
             ['values' => $this->getAttributeList($parameters)],
             ['values' => ' / '],
@@ -291,7 +291,7 @@ protected function replaceIn($message, $attribute, $rule, $parameters)
             $parameter = $this->getDisplayableValue($attribute, $parameter);
         }
 
-        return $this->replaceKeepCase(
+        return $this->replaceWhileKeepingCase(
             $message,
             ['values' => $this->getAttributeList($parameters)],
             ['values' => ', '],
@@ -423,7 +423,7 @@ protected function replacePresentUnless($message, $attribute, $rule, $parameters
      */
     protected function replacePresentWith($message, $attribute, $rule, $parameters)
     {
-        return $this->replaceKeepCase(
+        return $this->replaceWhileKeepingCase(
             $message,
             ['values' => $this->getAttributeList($parameters)],
             ['values' => ' / '],
@@ -455,7 +455,7 @@ protected function replacePresentWithAll($message, $attribute, $rule, $parameter
      */
     protected function replaceRequiredWith($message, $attribute, $rule, $parameters)
     {
-        return $this->replaceKeepCase(
+        return $this->replaceWhileKeepingCase(
             $message,
             ['values' => $this->getAttributeList($parameters)],
             ['values' => ' / '],
@@ -641,7 +641,7 @@ protected function replaceRequiredUnless($message, $attribute, $rule, $parameter
             $values[] = $this->getDisplayableValue($parameters[0], $value);
         }
 
-        return $this->replaceKeepCase(
+        return $this->replaceWhileKeepingCase(
             $message,
             ['other' => $other, 'values' => $values],
             ['values' => ', '],
@@ -715,7 +715,7 @@ protected function replaceProhibitedUnless($message, $attribute, $rule, $paramet
      */
     protected function replaceProhibits($message, $attribute, $rule, $parameters)
     {
-        return $this->replaceKeepCase(
+        return $this->replaceWhileKeepingCase(
             $message,
             ['other' => $this->getAttributeList($parameters)],
             ['other' => ' / '],

From eb8f9f733c604b7a5c4161a9588809bbf9f9943f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Wed, 29 Oct 2025 18:30:39 +0100
Subject: [PATCH 05/13] Fix argument order in method call

---
 src/Illuminate/Validation/Concerns/ReplacesAttributes.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
index cffa38762c0b..d511566d8a77 100644
--- a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
@@ -929,7 +929,7 @@ private function replaceWhileKeepingCase(string $message, array $mapping, $wordS
 
         $replacements = array_reduce(
             array_keys($mapping),
-            fn (array $carry, string $placeholder) => [...$carry, ...array_map(fn (callable $fn) => $fn($placeholder, $mapping[$placeholder]), $fn)],
+            fn (array $carry, string $placeholder) => [...$carry, ...array_map(fn (callable $fn) => $fn($mapping[$placeholder], $placeholder), $fn)],
             [],
         );
 

From 768dac77a8cb80c6c9df53064b43b8cc7bdbe020 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Wed, 29 Oct 2025 18:55:20 +0100
Subject: [PATCH 06/13] Separate ucwords() logic for cases and replacements

---
 .../Validation/Concerns/ReplacesAttributes.php        | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
index d511566d8a77..f7aebf0092ff 100644
--- a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
@@ -916,20 +916,21 @@ private function replaceWhileKeepingCase(string $message, array $mapping, $wordS
             Str::lower(...),
             Str::upper(...),
             //fn (string $placeholder, ?string $parameter = null) => ucwords($parameter ?? $placeholder, $parameter !== null ? ($wordSeparators[$placeholder] ?? ' ') : ' '),
-            fn (string $placeholder, ?string $parameter = null) => $parameter !== null && array_key_exists($placeholder, $wordSeparators)
-                ? ucwords($parameter, $wordSeparators[$placeholder])
-                : ucfirst($parameter ?? $placeholder),
         ];
+        
+        $ucwordsReplacement = fn (string $parameter, string $placeholder) => array_key_exists($placeholder, $wordSeparators)
+                ? ucwords($placeholder, $wordSeparators[$placeholder])
+                : ucfirst($parameter);
 
         $cases = array_reduce(
             array_keys($mapping),
-            fn (array $carry, string $placeholder) => [...$carry, ...array_map(fn (callable $fn) => ':'.$fn($placeholder), $fn)],
+            fn (array $carry, string $placeholder) => [...$carry, ...array_map(fn (callable $fn) => ':'.$fn($placeholder), [...$fn, ucfirst(...)])],
             [],
         );
 
         $replacements = array_reduce(
             array_keys($mapping),
-            fn (array $carry, string $placeholder) => [...$carry, ...array_map(fn (callable $fn) => $fn($mapping[$placeholder], $placeholder), $fn)],
+            fn (array $carry, string $placeholder) => [...$carry, ...array_map(fn (callable $fn) => $fn($mapping[$placeholder], $placeholder), [...$fn, $ucwordsReplacement])],
             [],
         );
 

From 24785e7754f279e8ae175e4c3264c735f488e6d7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Wed, 29 Oct 2025 18:56:14 +0100
Subject: [PATCH 07/13] StyleCI

---
 src/Illuminate/Validation/Concerns/ReplacesAttributes.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
index f7aebf0092ff..f7f76e2cfc05 100644
--- a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
@@ -917,7 +917,7 @@ private function replaceWhileKeepingCase(string $message, array $mapping, $wordS
             Str::upper(...),
             //fn (string $placeholder, ?string $parameter = null) => ucwords($parameter ?? $placeholder, $parameter !== null ? ($wordSeparators[$placeholder] ?? ' ') : ' '),
         ];
-        
+
         $ucwordsReplacement = fn (string $parameter, string $placeholder) => array_key_exists($placeholder, $wordSeparators)
                 ? ucwords($placeholder, $wordSeparators[$placeholder])
                 : ucfirst($parameter);

From e594617636ef9c75803593e0b48606c19e2212f8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Wed, 29 Oct 2025 19:04:15 +0100
Subject: [PATCH 08/13] Fix

---
 src/Illuminate/Validation/Concerns/ReplacesAttributes.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
index f7f76e2cfc05..694625d7e138 100644
--- a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
@@ -293,7 +293,7 @@ protected function replaceIn($message, $attribute, $rule, $parameters)
 
         return $this->replaceWhileKeepingCase(
             $message,
-            ['values' => $this->getAttributeList($parameters)],
+            ['values' => $parameters],
             ['values' => ', '],
         );
     }

From 5c75f2dc113e1be8177620ff99eb146b35165d1c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Wed, 29 Oct 2025 19:04:28 +0100
Subject: [PATCH 09/13] Type

---
 src/Illuminate/Validation/Concerns/ReplacesAttributes.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
index 694625d7e138..d212b825c9c7 100644
--- a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
@@ -910,7 +910,7 @@ protected function replaceDoesntContain($message, $attribute, $rule, $parameters
      * @param  array<string, string>  $mapping
      * @param  array<string, string>  $wordSeparators
      */
-    private function replaceWhileKeepingCase(string $message, array $mapping, $wordSeparators = []): string
+    private function replaceWhileKeepingCase(string $message, array $mapping, array $wordSeparators = []): string
     {
         $fn = [
             Str::lower(...),

From 4b1d736cadf8d55d87cc8ae363aa3c9e45b16189 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Wed, 29 Oct 2025 19:12:34 +0100
Subject: [PATCH 10/13] Allow array replacements

by using already passed $wordSeparators
---
 src/Illuminate/Validation/Concerns/ReplacesAttributes.php | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
index d212b825c9c7..e26c318a8dcd 100644
--- a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
@@ -930,7 +930,13 @@ private function replaceWhileKeepingCase(string $message, array $mapping, array
 
         $replacements = array_reduce(
             array_keys($mapping),
-            fn (array $carry, string $placeholder) => [...$carry, ...array_map(fn (callable $fn) => $fn($mapping[$placeholder], $placeholder), [...$fn, $ucwordsReplacement])],
+            fn (array $carry, string $placeholder) => [...$carry, ...array_map(function (callable $fn) use($placeholder, $mapping, $wordSeparators) {
+                $parameter = $mapping[$placeholder];
+                if (is_array($parameter) && array_is_list($parameter) && array_key_exists($placeholder, $wordSeparators)) {
+                    $parameter = implode($wordSeparators[$placeholder], $parameter);
+                }
+                return $fn($parameter, $placeholder);
+            }, [...$fn, $ucwordsReplacement])],
             [],
         );
 

From e9fcf5eace97a82560a9e1f568fa69ed107ee0b6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Wed, 29 Oct 2025 19:13:37 +0100
Subject: [PATCH 11/13] StyleCI

---
 src/Illuminate/Validation/Concerns/ReplacesAttributes.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
index e26c318a8dcd..378f25d93f95 100644
--- a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
@@ -930,11 +930,12 @@ private function replaceWhileKeepingCase(string $message, array $mapping, array
 
         $replacements = array_reduce(
             array_keys($mapping),
-            fn (array $carry, string $placeholder) => [...$carry, ...array_map(function (callable $fn) use($placeholder, $mapping, $wordSeparators) {
+            fn (array $carry, string $placeholder) => [...$carry, ...array_map(function (callable $fn) use ($placeholder, $mapping, $wordSeparators) {
                 $parameter = $mapping[$placeholder];
                 if (is_array($parameter) && array_is_list($parameter) && array_key_exists($placeholder, $wordSeparators)) {
                     $parameter = implode($wordSeparators[$placeholder], $parameter);
                 }
+
                 return $fn($parameter, $placeholder);
             }, [...$fn, $ucwordsReplacement])],
             [],

From 94bdfa289565c565bfaf7233724c349368dbf363 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Wed, 29 Oct 2025 20:20:28 +0100
Subject: [PATCH 12/13] Fix casing

See https://github.com/laravel/framework/pull/57564#issuecomment-3457631210
---
 tests/Validation/ValidationValidatorTest.php | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/tests/Validation/ValidationValidatorTest.php b/tests/Validation/ValidationValidatorTest.php
index b6ec5ac6722f..3289c50784a9 100755
--- a/tests/Validation/ValidationValidatorTest.php
+++ b/tests/Validation/ValidationValidatorTest.php
@@ -816,12 +816,12 @@ public function testDisplayableValuesAreReplaced()
         // in:foo,bar,...
         $trans = $this->getIlluminateArrayTranslator();
         $trans->addLines(['validation.in' => ':attribute must be included in :values.'], 'en');
-        $trans->addLines(['validation.values.type.5' => 'Short'], 'en');
-        $trans->addLines(['validation.values.type.300' => 'Long'], 'en');
+        $trans->addLines(['validation.values.type.5' => 'short'], 'en');
+        $trans->addLines(['validation.values.type.300' => 'long'], 'en');
         $v = new Validator($trans, ['type' => '4'], ['type' => 'in:5,300']);
         $this->assertFalse($v->passes());
         $v->messages()->setFormat(':message');
-        $this->assertSame('type must be included in Short, Long.', $v->messages()->first('type'));
+        $this->assertSame('type must be included in short, long.', $v->messages()->first('type'));
 
         // date_equals:tomorrow
         $trans = $this->getIlluminateArrayTranslator();
@@ -837,30 +837,30 @@ public function testDisplayableValuesAreReplaced()
         $trans->addLines(['validation.in' => ':attribute must be included in :values.'], 'en');
         $customValues = [
             'type' => [
-                '5' => 'Short',
-                '300' => 'Long',
+                '5' => 'short',
+                '300' => 'long',
             ],
         ];
         $v = new Validator($trans, ['type' => '4'], ['type' => 'in:5,300']);
         $v->addCustomValues($customValues);
         $this->assertFalse($v->passes());
         $v->messages()->setFormat(':message');
-        $this->assertSame('type must be included in Short, Long.', $v->messages()->first('type'));
+        $this->assertSame('type must be included in short, long.', $v->messages()->first('type'));
 
         // set custom values by setter
         $trans = $this->getIlluminateArrayTranslator();
         $trans->addLines(['validation.in' => ':attribute must be included in :values.'], 'en');
         $customValues = [
             'type' => [
-                '5' => 'Short',
-                '300' => 'Long',
+                '5' => 'short',
+                '300' => 'long',
             ],
         ];
         $v = new Validator($trans, ['type' => '4'], ['type' => 'in:5,300']);
         $v->setValueNames($customValues);
         $this->assertFalse($v->passes());
         $v->messages()->setFormat(':message');
-        $this->assertSame('type must be included in Short, Long.', $v->messages()->first('type'));
+        $this->assertSame('type must be included in short, long.', $v->messages()->first('type'));
     }
 
     public function testDisplayableAttributesAreReplacedInCustomReplacers()

From 261450b563a096eb1fa31ea1d1799b05e38a001f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20H=C3=A4drich?=
 <11225821+shaedrich@users.noreply.github.com>
Date: Wed, 29 Oct 2025 20:29:33 +0100
Subject: [PATCH 13/13] Fix

---
 src/Illuminate/Validation/Concerns/ReplacesAttributes.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
index 378f25d93f95..f070a30de609 100644
--- a/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
+++ b/src/Illuminate/Validation/Concerns/ReplacesAttributes.php
@@ -919,7 +919,7 @@ private function replaceWhileKeepingCase(string $message, array $mapping, array
         ];
 
         $ucwordsReplacement = fn (string $parameter, string $placeholder) => array_key_exists($placeholder, $wordSeparators)
-                ? ucwords($placeholder, $wordSeparators[$placeholder])
+                ? ucwords($parameter, $wordSeparators[$placeholder])
                 : ucfirst($parameter);
 
         $cases = array_reduce(