Fix code style

Author: david-valdivia

tests/Support/SupportArrTest.php

@@ -998,30 +998,30 @@ public function testMapKeys()
     {
         // Basic transformation
         $array = ['first_name' => 'Taylor', 'last_name' => 'Otwell'];
-        $result = Arr::mapKeys($array, fn($key) => Str::camel($key));
+        $result = Arr::mapKeys($array, fn ($key) => Str::camel($key));
         $this->assertEquals(['firstName' => 'Taylor', 'lastName' => 'Otwell'], $result);
 
         // With value parameter
         $array = ['name' => 'Taylor', 'age' => 31];
-        $result = Arr::mapKeys($array, fn($key, $value) => is_numeric($value) ? "num_{$key}" : $key);
+        $result = Arr::mapKeys($array, fn ($key, $value) => is_numeric($value) ? "num_{$key}" : $key);
         $this->assertEquals(['name' => 'Taylor', 'num_age' => 31], $result);
 
         // Key collision - last wins
         $array = ['name' => 'First', 'NAME' => 'Second'];
-        $result = Arr::mapKeys($array, fn($key) => strtolower($key));
+        $result = Arr::mapKeys($array, fn ($key) => strtolower($key));
         $this->assertEquals(['name' => 'Second'], $result);
 
         // Empty array
         $this->assertEquals([], Arr::mapKeys([], fn($key) => $key));
 
         // Numeric keys
         $array = [1, 2, 3];
-        $result = Arr::mapKeys($array, fn($key) => "item_{$key}");
+        $result = Arr::mapKeys($array, fn ($key) => "item_{$key}");
         $this->assertEquals(['item_0' => 1, 'item_1' => 2, 'item_2' => 3], $result);
 
         // Prefix example
         $config = ['host' => 'localhost', 'port' => 3306, 'database' => 'app'];
-        $result = Arr::mapKeys($config, fn($key) => "db_{$key}");
+        $result = Arr::mapKeys($config, fn ($key) => "db_{$key}");
         $this->assertEquals(['db_host' => 'localhost', 'db_port' => 3306, 'db_database' => 'app'], $result);
     }