diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
index a373421..4ff4567 100644
--- a/.php-cs-fixer.php
+++ b/.php-cs-fixer.php
@@ -38,6 +38,7 @@
         PhpCsFixer\Finder::create()
             ->exclude('test')
             ->exclude('runtime')
+            ->exclude('.github')
             ->exclude('vendor')
             ->in(__DIR__)
     )
diff --git a/example/cliapp.php b/example/cliapp.php
index 443b08c..46ae421 100644
--- a/example/cliapp.php
+++ b/example/cliapp.php
@@ -1,4 +1,11 @@
-<?php
+<?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 use Toolkit\Cli\Cli;
 use Toolkit\PFlag\CliApp;
@@ -10,10 +17,11 @@
 // run demo:
 // php example/cliapp.php
 
-$app = CliApp::newWith(function (CliApp $app) {
+$cli = CliApp::newWith(static function (CliApp $app): void {
     $app->setName('myApp');
+    $app->setDesc('my cli application. v1.0.1');
 })
-    ->add('test1', fn(FlagsParser $fs) => vdump($fs->getOpts()), [
+    ->add('test1', fn (FlagsParser $fs) => vdump($fs->getOpts()), [
         'desc'    => 'the test 1 command',
         'options' => [
             'opt1' => 'opt1 for command test1',
@@ -21,7 +29,7 @@
         ],
     ]);
 
-$app->add('test2', function (FlagsParser $fs) {
+$cli->add('test2', function (FlagsParser $fs): void {
     Cli::info('options:');
     vdump($fs->getOpts());
     Cli::info('arguments:');
@@ -37,9 +45,8 @@
     ]
 ]);
 
-$app->add('show-err', fn() => throw new RuntimeException('test show exception'));
+$cli->add('show-err', fn () => throw new RuntimeException('test show exception'));
 
-$app->addHandler(DemoCmdHandler::class);
-
-$app->run();
+$cli->addHandler(DemoCmdHandler::class);
 
+$cli->run();
diff --git a/example/clicmd.php b/example/clicmd.php
index f08c7a9..9015703 100644
--- a/example/clicmd.php
+++ b/example/clicmd.php
@@ -1,4 +1,11 @@
-<?php
+<?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 use Toolkit\Cli\Cli;
 use Toolkit\PFlag\CliCmd;
@@ -11,7 +18,7 @@
 // php example/clicmd.php --name inhere value1
 // php example/clicmd.php --age 23 --name inhere value1
 
-CliCmd::newWith(function (CliCmd $cmd) {
+CliCmd::newWith(static function (CliCmd $cmd): void {
     $cmd->name = 'demo';
     $cmd->desc = 'description for demo command';
 
@@ -28,11 +35,10 @@
     ->withArguments([
         'arg1' => 'this is arg1, is string'
     ])
-    ->setHandler(function (FlagsParser $fs) {
+    ->setHandler(function (FlagsParser $fs): void {
         Cli::info('options:');
         vdump($fs->getOpts());
         Cli::info('arguments:');
         vdump($fs->getArgs());
     })
     ->run();
-
diff --git a/example/not-stop_on_first.php b/example/not-stop_on_first.php
index f43ac7a..8ee5689 100644
--- a/example/not-stop_on_first.php
+++ b/example/not-stop_on_first.php
@@ -1,5 +1,11 @@
-<?php
-// run: php example/not-stop_on_first.php
+<?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 use Toolkit\PFlag\Flags;
 
diff --git a/example/refer.php b/example/refer.php
index c45b7df..9fd1ce4 100644
--- a/example/refer.php
+++ b/example/refer.php
@@ -1,7 +1,14 @@
-<?php
+<?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 $flags = ['--name', 'inhere', '--tags', 'php', '-t', 'go', '--tags', 'java', '-f', 'arg0'];
-echo "count: ", count($flags), "\n";
+echo 'count: ', count($flags), "\n";
 
 $cur = current($flags);
 $key = key($flags);
diff --git a/example/sflags-demo.php b/example/sflags-demo.php
index 8460aea..6c9eba4 100644
--- a/example/sflags-demo.php
+++ b/example/sflags-demo.php
@@ -73,4 +73,4 @@
     $fs->getArgs()
 );
 
-// vdump($fs->getArg('arrArg'));
\ No newline at end of file
+// vdump($fs->getArg('arrArg'));
diff --git a/src/CliApp.php b/src/CliApp.php
index a5106c7..dfb8d52 100644
--- a/src/CliApp.php
+++ b/src/CliApp.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag;
 
@@ -660,14 +667,20 @@ public function setParams(array $params): void
 
     /**
      * @param string $name
-     *
-     * @return void
      */
     public function setName(string $name): void
     {
         $this->params['name'] = $name;
     }
 
+    /**
+     * @param string $name
+     */
+    public function setDesc(string $name): void
+    {
+        $this->params['name'] = $name;
+    }
+
     /**
      * @return FlagsParser
      */
diff --git a/src/CliCmd.php b/src/CliCmd.php
index a50d0cf..fee1fbd 100644
--- a/src/CliCmd.php
+++ b/src/CliCmd.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag;
 
@@ -18,6 +25,7 @@ class CliCmd
     }
 
     public string $name = '';
+
     public string $desc = 'command description';
 
     /**
diff --git a/src/Concern/HelperRenderTrait.php b/src/Concern/HelperRenderTrait.php
index 910cfe8..6cbc6fe 100644
--- a/src/Concern/HelperRenderTrait.php
+++ b/src/Concern/HelperRenderTrait.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Concern;
 
diff --git a/src/Concern/RuleParserTrait.php b/src/Concern/RuleParserTrait.php
index a7bbec2..16943f2 100644
--- a/src/Concern/RuleParserTrait.php
+++ b/src/Concern/RuleParserTrait.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Concern;
 
@@ -292,7 +299,7 @@ protected function parseRuleOptName(string $key): array
 
             // max length string as option name.
             if (($kl = strlen($k)) > 1) {
-                if (!$name ) {
+                if (!$name) {
                     $name = $k;
                 } elseif ($kl > strlen($name)) {
                     $aliases[] = $name;
diff --git a/src/Contract/CmdHandlerInterface.php b/src/Contract/CmdHandlerInterface.php
index 69765b1..83be517 100644
--- a/src/Contract/CmdHandlerInterface.php
+++ b/src/Contract/CmdHandlerInterface.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Contract;
 
diff --git a/src/Contract/ParserInterface.php b/src/Contract/ParserInterface.php
index 11fded7..31bb39e 100644
--- a/src/Contract/ParserInterface.php
+++ b/src/Contract/ParserInterface.php
@@ -17,6 +17,7 @@
 interface ParserInterface
 {
     public const KIND_OPT = 'option';
+
     public const KIND_ARG = 'argument';
 
     /**
@@ -282,5 +283,4 @@ public function unlock(): void;
      * @return bool
      */
     public function isLocked(): bool;
-
 }
diff --git a/src/Contract/ValidatorInterface.php b/src/Contract/ValidatorInterface.php
index 68d74a4..fe6e00d 100644
--- a/src/Contract/ValidatorInterface.php
+++ b/src/Contract/ValidatorInterface.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Contract;
 
diff --git a/src/Contract/ValueInterface.php b/src/Contract/ValueInterface.php
index 2f95a69..cd7afdb 100644
--- a/src/Contract/ValueInterface.php
+++ b/src/Contract/ValueInterface.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Contract;
 
diff --git a/src/Exception/FlagParseException.php b/src/Exception/FlagParseException.php
index 689400d..8e505f2 100644
--- a/src/Exception/FlagParseException.php
+++ b/src/Exception/FlagParseException.php
@@ -1,8 +1,14 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Exception;
 
-use Throwable;
 use Toolkit\PFlag\FlagsParser;
 
 /**
diff --git a/src/Flag/Option.php b/src/Flag/Option.php
index 573978d..fc907a4 100644
--- a/src/Flag/Option.php
+++ b/src/Flag/Option.php
@@ -9,7 +9,6 @@
 
 namespace Toolkit\PFlag\Flag;
 
-use Toolkit\Cli\Helper\FlagHelper;
 use Toolkit\PFlag\Exception\FlagException;
 use Toolkit\PFlag\FlagType;
 use Toolkit\PFlag\FlagUtil;
@@ -200,5 +199,4 @@ public function toArray(): array
         $info['shorts']  = $this->shorts;
         return $info;
     }
-
 }
diff --git a/src/FlagUtil.php b/src/FlagUtil.php
index 612fe9b..ebddf90 100644
--- a/src/FlagUtil.php
+++ b/src/FlagUtil.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag;
 
diff --git a/src/FlagsParser.php b/src/FlagsParser.php
index 16d7bd8..0a8aa9a 100644
--- a/src/FlagsParser.php
+++ b/src/FlagsParser.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag;
 
@@ -30,6 +37,7 @@ abstract class FlagsParser implements ParserInterface
     use RuleParserTrait;
 
     public const TRIM_CHARS    = "; \t\n\r\0\x0B";
+
     public const OPT_MAX_WIDTH = 16;
 
     public const RULE_SEP = ';';
@@ -49,6 +57,7 @@ abstract class FlagsParser implements ParserInterface
      *  - posix: `-abc`  will expand: `-a=bc`
      */
     public const SHORT_STYLE_GUN   = 'gnu';
+
     public const SHORT_STYLE_POSIX = 'posix';
 
     public const DEFINE_ITEM = [
diff --git a/src/Helper/ValueBinding.php b/src/Helper/ValueBinding.php
index 3681c65..eef2f13 100644
--- a/src/Helper/ValueBinding.php
+++ b/src/Helper/ValueBinding.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Helper;
 
@@ -7,5 +14,4 @@
  */
 class ValueBinding
 {
-
 }
diff --git a/src/Helper/ValueCollector.php b/src/Helper/ValueCollector.php
index 554ae1a..6d3a012 100644
--- a/src/Helper/ValueCollector.php
+++ b/src/Helper/ValueCollector.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Helper;
 
@@ -23,6 +30,5 @@ public function new(): self
      */
     public function collect(FlagsParser $fs): void
     {
-
     }
 }
diff --git a/src/Validator/AbstractValidator.php b/src/Validator/AbstractValidator.php
index a2c7f6e..da8149b 100644
--- a/src/Validator/AbstractValidator.php
+++ b/src/Validator/AbstractValidator.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Validator;
 
diff --git a/src/Validator/CondValidator.php b/src/Validator/CondValidator.php
index a1dfd9d..1b976b7 100644
--- a/src/Validator/CondValidator.php
+++ b/src/Validator/CondValidator.php
@@ -1,8 +1,14 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Validator;
 
-use Closure;
 use Toolkit\PFlag\FlagsParser;
 
 /**
diff --git a/src/Validator/EmptyValidator.php b/src/Validator/EmptyValidator.php
index 0b4659e..ab5d72b 100644
--- a/src/Validator/EmptyValidator.php
+++ b/src/Validator/EmptyValidator.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Validator;
 
diff --git a/src/Validator/EnumValidator.php b/src/Validator/EnumValidator.php
index ad89e2e..07ace97 100644
--- a/src/Validator/EnumValidator.php
+++ b/src/Validator/EnumValidator.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Validator;
 
diff --git a/src/Validator/FuncValidator.php b/src/Validator/FuncValidator.php
index 1545304..9adda40 100644
--- a/src/Validator/FuncValidator.php
+++ b/src/Validator/FuncValidator.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Validator;
 
diff --git a/src/Validator/LenValidator.php b/src/Validator/LenValidator.php
index fc835e1..a3584c5 100644
--- a/src/Validator/LenValidator.php
+++ b/src/Validator/LenValidator.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Validator;
 
diff --git a/src/Validator/MultiValidator.php b/src/Validator/MultiValidator.php
index bc83492..8f0513e 100644
--- a/src/Validator/MultiValidator.php
+++ b/src/Validator/MultiValidator.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Validator;
 
diff --git a/src/Validator/NameValidator.php b/src/Validator/NameValidator.php
index fc20779..9ce3047 100644
--- a/src/Validator/NameValidator.php
+++ b/src/Validator/NameValidator.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Validator;
 
diff --git a/src/Validator/RegexValidator.php b/src/Validator/RegexValidator.php
index 2c8a416..c569bf2 100644
--- a/src/Validator/RegexValidator.php
+++ b/src/Validator/RegexValidator.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlag\Validator;
 
diff --git a/test/BaseFlagsTestCase.php b/test/BaseFlagsTestCase.php
index f5cc685..5ebfca5 100644
--- a/test/BaseFlagsTestCase.php
+++ b/test/BaseFlagsTestCase.php
@@ -46,11 +46,11 @@ protected function runAndGetException(callable $cb, ...$args): Throwable
      */
     protected function runTestsWithParsers(Closure $testFunc): void
     {
-        echo "- tests by use the parser: ", Flags::class, "\n";
+        echo '- tests by use the parser: ', Flags::class, "\n";
         $fs = Flags::new(['name' => 'flags']);
         $testFunc($fs);
 
-        echo "- tests by use the parser: ", SFlags::class, "\n";
+        echo '- tests by use the parser: ', SFlags::class, "\n";
         $sfs = SFlags::new(['name' => 'simple-flags']);
         $testFunc($sfs);
     }
@@ -84,5 +84,4 @@ protected function bindingOptsAndArgs(FlagsParser $fs): void
         $fs->addOptsByRules($optRules);
         $fs->addArgsByRules($argRules);
     }
-
 }
diff --git a/test/Cases/DemoCmdHandler.php b/test/Cases/DemoCmdHandler.php
index ace1304..d2eb510 100644
--- a/test/Cases/DemoCmdHandler.php
+++ b/test/Cases/DemoCmdHandler.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlagTest\Cases;
 
diff --git a/test/Cases/RuleParser.php b/test/Cases/RuleParser.php
index a6acff9..06db5b3 100644
--- a/test/Cases/RuleParser.php
+++ b/test/Cases/RuleParser.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlagTest\Cases;
 
diff --git a/test/CliAppTest.php b/test/CliAppTest.php
index 091cff3..ba561f0 100644
--- a/test/CliAppTest.php
+++ b/test/CliAppTest.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlagTest;
 
@@ -18,12 +25,12 @@ private function initApp(CliApp $app): DataObject
         $buf = DataObject::new();
 
         // php 7.4+
-        $app->add('test1', fn() => $buf->set('key', 'in test1'));
+        $app->add('test1', fn () => $buf->set('key', 'in test1'));
 
         $app->addCommands([
             'test2' => [
                 'desc'    => 'desc for test2 command',
-                'handler' => function () use ($buf) {
+                'handler' => function () use ($buf): void {
                     $buf->set('key', 'in test2');
                 },
                 'options' => [
diff --git a/test/Concern/RuleParserTest.php b/test/Concern/RuleParserTest.php
index 0a2c534..b6d8c12 100644
--- a/test/Concern/RuleParserTest.php
+++ b/test/Concern/RuleParserTest.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlagTest\Concern;
 
@@ -40,7 +47,6 @@ public function testParseRule_string(): void
         $this->assertSame(['23', '45'], $define['default']);
     }
 
-
     public function testParseRule_string_hasAliases(): void
     {
         $p = RuleParser::new();
diff --git a/test/Flag/ArgumentTest.php b/test/Flag/ArgumentTest.php
index cde21fe..23484af 100644
--- a/test/Flag/ArgumentTest.php
+++ b/test/Flag/ArgumentTest.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlagTest\Flag;
 
diff --git a/test/Flag/OptionTest.php b/test/Flag/OptionTest.php
index a5b3c30..6243f67 100644
--- a/test/Flag/OptionTest.php
+++ b/test/Flag/OptionTest.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlagTest\Flag;
 
diff --git a/test/FlagUtilTest.php b/test/FlagUtilTest.php
index b0871ec..7c1b56c 100644
--- a/test/FlagUtilTest.php
+++ b/test/FlagUtilTest.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlagTest;
 
diff --git a/test/FlagsParserTest.php b/test/FlagsParserTest.php
index 929c39b..f4164db 100644
--- a/test/FlagsParserTest.php
+++ b/test/FlagsParserTest.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlagTest;
 
@@ -14,7 +21,7 @@ class FlagsParserTest extends BaseFlagsTestCase
 {
     public function testParserBasic(): void
     {
-        $this->runTestsWithParsers(function (FlagsParser $fs) {
+        $this->runTestsWithParsers(function (FlagsParser $fs): void {
             $this->doCheckBasic($fs);
         });
     }
@@ -63,7 +70,7 @@ private function doCheckBasic(FlagsParser $fs): void
 
     public function testGetOptAndGetArg(): void
     {
-        $this->runTestsWithParsers(function (FlagsParser $fs) {
+        $this->runTestsWithParsers(function (FlagsParser $fs): void {
             $this->bindingOptsAndArgs($fs);
             $this->doTestGetOptAndGetArg($fs);
         });
@@ -81,7 +88,7 @@ private function doTestGetOptAndGetArg(FlagsParser $fs): void
         $fs->resetResults();
 
         // getMustOpt
-        $e = $this->runAndGetException(function (FlagsParser $fs) {
+        $e = $this->runAndGetException(function (FlagsParser $fs): void {
             $fs->getMustOpt('str-opt');
         }, $fs);
 
@@ -89,7 +96,7 @@ private function doTestGetOptAndGetArg(FlagsParser $fs): void
         $this->assertSame("The option 'str-opt' is required", $e->getMessage());
 
         // getMustArg
-        $e = $this->runAndGetException(function (FlagsParser $fs) {
+        $e = $this->runAndGetException(function (FlagsParser $fs): void {
             $fs->getMustArg('str-arg');
         }, $fs);
 
@@ -99,7 +106,7 @@ private function doTestGetOptAndGetArg(FlagsParser $fs): void
 
     public function testParse_specialArg(): void
     {
-        $this->runTestsWithParsers(function (FlagsParser $fs) {
+        $this->runTestsWithParsers(function (FlagsParser $fs): void {
             $fs->addOpt('a', '', 'an string opt');
             $fs->addArg('num', 'an int arg', 'int');
 
@@ -117,7 +124,7 @@ public function testParse_specialArg(): void
 
     public function testStopOnTwoHl(): void
     {
-        $this->runTestsWithParsers(function (FlagsParser $fs) {
+        $this->runTestsWithParsers(function (FlagsParser $fs): void {
             $this->doCheckStopOnTwoHl($fs);
         });
     }
@@ -140,7 +147,7 @@ private function doCheckStopOnTwoHl(FlagsParser $fs): void
 
     public function testStopOnFirstArg(): void
     {
-        $this->runTestsWithParsers(function (FlagsParser $fs) {
+        $this->runTestsWithParsers(function (FlagsParser $fs): void {
             $this->runStopOnFirstArg($fs);
         });
     }
@@ -191,11 +198,11 @@ private function runStopOnFirstArg(FlagsParser $fs): void
 
     public function testSkipOnUndefined(): void
     {
-        $this->runTestsWithParsers(function (FlagsParser $fs) {
+        $this->runTestsWithParsers(function (FlagsParser $fs): void {
             $this->runSkipOnUndefined_false($fs);
         });
 
-        $this->runTestsWithParsers(function (FlagsParser $fs) {
+        $this->runTestsWithParsers(function (FlagsParser $fs): void {
             $this->runSkipOnUndefined_true($fs);
         });
     }
@@ -240,7 +247,7 @@ private function runSkipOnUndefined_true(FlagsParser $fs): void
 
     public function testRenderHelp_showTypeOnHelp(): void
     {
-        $this->runTestsWithParsers(function (FlagsParser $fs) {
+        $this->runTestsWithParsers(function (FlagsParser $fs): void {
             $this->bindingOptsAndArgs($fs);
             $this->renderFlagsHelp($fs);
         });
@@ -248,7 +255,7 @@ public function testRenderHelp_showTypeOnHelp(): void
 
     public function testRenderHelp_showTypeOnHelp_false(): void
     {
-        $this->runTestsWithParsers(function (FlagsParser $fs) {
+        $this->runTestsWithParsers(function (FlagsParser $fs): void {
             $fs->setShowTypeOnHelp(false);
             $this->bindingOptsAndArgs($fs);
             $this->renderFlagsHelp($fs);
@@ -271,7 +278,7 @@ public function testException_RepeatName(): void
 
     protected function doCheckRepeatName(FlagsParser $fs): void
     {
-        $e = $this->runAndGetException(function (FlagsParser $fs) {
+        $e = $this->runAndGetException(function (FlagsParser $fs): void {
             $fs->addOptsByRules([
                 '--name' => 'an string',
                 'name'   => 'an string',
@@ -280,7 +287,7 @@ protected function doCheckRepeatName(FlagsParser $fs): void
 
         $this->assertEquals(FlagException::class, get_class($e));
 
-        $e = $this->runAndGetException(function (FlagsParser $fs) {
+        $e = $this->runAndGetException(function (FlagsParser $fs): void {
             $fs->addArgsByRules([
                 'name' => 'an string',
             ]);
@@ -300,7 +307,7 @@ public function testException_addOpt(): void
     private function doCheckErrorOnAddOpt(FlagsParser $fs): void
     {
         // empty name
-        $e = $this->runAndGetException(function (FlagsParser $fs) {
+        $e = $this->runAndGetException(function (FlagsParser $fs): void {
             $fs->addOpt('', '', 'an desc');
         }, $fs);
 
@@ -308,7 +315,7 @@ private function doCheckErrorOnAddOpt(FlagsParser $fs): void
         $this->assertSame('invalid flag option name: ', $e->getMessage());
 
         // invalid name
-        $e = $this->runAndGetException(function (FlagsParser $fs) {
+        $e = $this->runAndGetException(function (FlagsParser $fs): void {
             $fs->addOpt('name=+', '', 'an desc');
         }, $fs);
 
@@ -316,7 +323,7 @@ private function doCheckErrorOnAddOpt(FlagsParser $fs): void
         $this->assertSame('invalid flag option name: name=+', $e->getMessage());
 
         // invalid type
-        $e = $this->runAndGetException(function (FlagsParser $fs) {
+        $e = $this->runAndGetException(function (FlagsParser $fs): void {
             $fs->addOpt('name', '', 'an desc', 'invalid');
         }, $fs);
 
@@ -334,7 +341,7 @@ public function testException_addArg(): void
     private function doCheckErrorOnAddArg(FlagsParser $fs): void
     {
         // invalid name
-        $e = $this->runAndGetException(function (FlagsParser $fs) {
+        $e = $this->runAndGetException(function (FlagsParser $fs): void {
             $fs->addArg('name=+', 'an desc');
         }, $fs);
 
@@ -342,7 +349,7 @@ private function doCheckErrorOnAddArg(FlagsParser $fs): void
         $this->assertSame('invalid flag argument name: #0(name=+)', $e->getMessage());
 
         // invalid type
-        $e = $this->runAndGetException(function (FlagsParser $fs) {
+        $e = $this->runAndGetException(function (FlagsParser $fs): void {
             $fs->addArg('name', 'an desc', 'invalid');
         }, $fs);
 
@@ -383,14 +390,14 @@ private function doCheckSetOptAndSetArg($fs): void
         $this->assertSame('trust-value1', $fs->getArg('str-arg'));
 
         // test error
-        $e = $this->runAndGetException(function (FlagsParser $fs) {
+        $e = $this->runAndGetException(function (FlagsParser $fs): void {
             $fs->setOpt('not-exist-opt', '22');
         }, $fs);
 
         $this->assertSame(FlagException::class, get_class($e));
         $this->assertSame("flag option 'not-exist-opt' is undefined", $e->getMessage());
 
-        $e = $this->runAndGetException(function (FlagsParser $fs) {
+        $e = $this->runAndGetException(function (FlagsParser $fs): void {
             $fs->setArg('not-exist-arg', '22');
         }, $fs);
 
diff --git a/test/FlagsTest.php b/test/FlagsTest.php
index fb00317..092e0dd 100644
--- a/test/FlagsTest.php
+++ b/test/FlagsTest.php
@@ -40,7 +40,7 @@ public function testAddOptionAndParse(): void
         $fs->parse($flags);
 
         self::assertTrue($fs->hasMatched('name'));
-        $this->assertNotEmpty( $fs->getOption('name'));
+        $this->assertNotEmpty($fs->getOption('name'));
         $this->assertSame('inhere', $fs->getOpt('name'));
         $this->assertSame(0, $fs->getOpt('age', 0));
         $this->assertSame(89, $fs->getOpt('int1'));
diff --git a/test/SFlagsTest.php b/test/SFlagsTest.php
index d15eea3..55fefb1 100644
--- a/test/SFlagsTest.php
+++ b/test/SFlagsTest.php
@@ -139,5 +139,4 @@ public function testOptRule_required(): void
         ]);
         $fs->parse([]);
     }
-
 }
diff --git a/test/ValidatorTest.php b/test/ValidatorTest.php
index e43b473..04c16e0 100644
--- a/test/ValidatorTest.php
+++ b/test/ValidatorTest.php
@@ -1,4 +1,11 @@
 <?php declare(strict_types=1);
+/**
+ * This file is part of toolkit/pflag.
+ *
+ * @link     https://github.com/php-toolkit
+ * @author   https://github.com/inhere
+ * @license  MIT
+ */
 
 namespace Toolkit\PFlagTest;