[7.x] Fix: replaceInputPlaceholder() should replace :input by its dis…

…playable value (laravel#30878)

* Fix: replaceInputPlaceholder() should replace :input by its displayable value

* Test: testInputIsReplacedByItsDisplayableValue()

src/Illuminate/Validation/Concerns/FormatsMessages.php

@@ -295,7 +295,7 @@ protected function replaceInputPlaceholder($message, $attribute)
         $actualValue = $this->getValue($attribute);
 
         if (is_scalar($actualValue) || is_null($actualValue)) {
-            $message = str_replace(':input', $actualValue, $message);
+            $message = str_replace(':input', $this->getDisplayableValue($attribute, $actualValue), $message);
         }
 
         return $message;

tests/Validation/ValidationValidatorTest.php

@@ -404,6 +404,27 @@ public function testInputIsReplaced()
         $this->assertSame(' is not a valid email', $v->messages()->first('email'));
     }
 
+    public function testInputIsReplacedByItsDisplayableValue()
+    {
+        $frameworks = [
+            1 => 'Laravel',
+            2 => 'Symfony',
+            3 => 'Rails',
+        ];
+
+        $trans = $this->getIlluminateArrayTranslator();
+        $trans->addLines(['validation.framework_php' => ':input is not a valid PHP Framework'], 'en');
+
+        $v = new Validator($trans, ['framework' => 3], ['framework' => 'framework_php']);
+        $v->addExtension('framework_php', function ($attribute, $value, $parameters, $validator) {
+            return in_array($value, [1, 2]);
+        });
+        $v->addCustomValues(['framework' => $frameworks]);
+
+        $this->assertFalse($v->passes());
+        $this->assertSame('Rails is not a valid PHP Framework', $v->messages()->first('framework'));
+    }
+
     public function testDisplayableValuesAreReplaced()
     {
         //required_if:foo,bar