Handle unicode characters on TrimStrings middleware (#40600)

Author: rodrigopedra

src/Illuminate/Foundation/Http/Middleware/TrimStrings.php

@@ -53,7 +53,7 @@ protected function transform($key, $value)
             return $value;
         }
 
-        return is_string($value) ? trim($value, "  \t\n\r\0\x0B") : $value;
+        return is_string($value) ? preg_replace('~^\s+|\s+$~iu', '', $value) : $value;
     }
 
     /**

tests/Foundation/Http/Middleware/TrimStringsTest.php

@@ -35,12 +35,20 @@ public function testTrimStringsNBSP()
         $symfonyRequest = new SymfonyRequest([
             // Here has some NBSP, but it still display to space.
             'abc' => '   123    ',
+            'xyz' => 'だ',
+            'foo' => 'ム',
+            'bar' => '   だ    ',
+            'baz' => '   ム    ',
         ]);
         $symfonyRequest->server->set('REQUEST_METHOD', 'GET');
         $request = Request::createFromBase($symfonyRequest);
 
         $middleware->handle($request, function (Request $request) {
             $this->assertSame('123', $request->get('abc'));
+            $this->assertSame('だ', $request->get('xyz'));
+            $this->assertSame('ム', $request->get('foo'));
+            $this->assertSame('だ', $request->get('bar'));
+            $this->assertSame('ム', $request->get('baz'));
         });
     }
 }