diff --git a/src/Directory.php b/src/Directory.php
index 5660403..5d3ebe6 100644
--- a/src/Directory.php
+++ b/src/Directory.php
@@ -180,27 +180,27 @@ public static function getDirs($path, $loop = false, $parent = null, array $list
      * @return array
      * @throws FileNotFoundException
      */
-    public static function simpleInfo($dir, $ext = null, $recursive = false): array
+    public static function simpleInfo(string $dir, $ext = null, $recursive = false): array
     {
         $list = [];
         $dir = self::pathFormat($dir);
-        $ext = \is_array($ext) ? implode('|', $ext) : trim($ext);
+        $ext = \is_array($ext) ? \implode('|', $ext) : \trim($ext);
 
-        if (!is_dir($dir)) {
+        if (!\is_dir($dir)) {
             throw new FileNotFoundException("directory not exists! DIR: $dir");
         }
 
         // glob()寻找与模式匹配的文件路径 $file is pull path
-        foreach (glob($dir . '*') as $file) {
+        foreach (\glob($dir . '*') as $file) {
 
             // 匹配文件 如果没有传入$ext 则全部遍历，传入了则按传入的类型来查找
-            if (is_file($file) && (!$ext || preg_match("/\.($ext)$/i", $file))) {
+            if (\is_file($file) && (!$ext || \preg_match("/\.($ext)$/i", $file))) {
                 //basename — 返回路径中的 文件名部分
-                $list[] = basename($file);
+                $list[] = \basename($file);
 
                 // is directory
             } else {
-                $list[] = '/' . basename($file);
+                $list[] = '/' . \basename($file);
 
                 if ($recursive) {
                     $list = array_merge($list, self::simpleInfo($file, $ext, $recursive));
@@ -221,7 +221,7 @@ public static function simpleInfo($dir, $ext = null, $recursive = false): array
      * @return array
      * @throws FileNotFoundException
      */
-    public static function getFiles($path, $ext = null, $recursive = false, $parent = null, array $list = []): array
+    public static function getFiles(string $path, $ext = null, $recursive = false, $parent = null, array $list = []): array
     {
         $path = self::pathFormat($path);
 
@@ -230,13 +230,13 @@ public static function getFiles($path, $ext = null, $recursive = false, $parent
         }
 
         $len = \strlen($path);
-        $ext = \is_array($ext) ? implode('|', $ext) : trim($ext);
+        $ext = \is_array($ext) ? \implode('|', $ext) : \trim($ext);
 
         foreach (glob($path . '*') as $v) {
             $relatePath = substr($v, $len);
 
             // 匹配文件 如果没有传入$ext 则全部遍历，传入了则按传入的类型来查找
-            if (is_file($v) && (!$ext || preg_match("/\.($ext)$/i", $v))) {
+            if (\is_file($v) && (!$ext || \preg_match("/\.($ext)$/i", $v))) {
                 $list[] = $parent . $relatePath;
 
             } elseif ($recursive) {
diff --git a/src/File.php b/src/File.php
index 805e83e..d7e918c 100644
--- a/src/File.php
+++ b/src/File.php
@@ -124,7 +124,7 @@ public static function save(string $filename, string $data): bool
      * @param $path
      * @throws IOException
      */
-    public static function write($content, $path)
+    public static function write($content, $path): void
     {
         $handler = static::openHandler($path);
 
@@ -154,7 +154,7 @@ public static function openHandler(string $path)
      * @param string   $path The path to the file (for exception printing only).
      * @throws IOException
      */
-    public static function writeToFile($handler, string $content, string $path = '')
+    public static function writeToFile($handler, string $content, string $path = ''): void
     {
         if (($result = @fwrite($handler, $content)) === false || ($result < \strlen($content))) {
             throw new IOException('The file "' . $path . '" could not be written to. Check your disk space and file permissions.');
@@ -172,7 +172,7 @@ public static function writeToFile($handler, string $content, string $path = '')
      *      'case.html'   => 'content' ,
      *  );
      **/
-    public static function createAndWrite(array $fileData = [], $append = false, $mode = 0664)
+    public static function createAndWrite(array $fileData = [], $append = false, $mode = 0664): void
     {
         foreach ($fileData as $file => $content) {
             //检查目录是否存在，不存在就先创建（多级）目录
@@ -262,7 +262,7 @@ public static function getContents(
      * @throws FileSystemException
      * @throws IOException
      */
-    public static function move(string $file, string $target)
+    public static function move(string $file, string $target): void
     {
         Directory::mkdir(\dirname($target));
 
@@ -388,7 +388,7 @@ public static function stripPhpCode(string $source): string
      * @param string $file
      * @param string $as
      */
-    public static function downBigFile($file, $as)
+    public static function downBigFile($file, $as): void
     {
         header('Expires: Mon, 1 Apr 1974 05:00:00 GMT');
         header('Pragma: no-cache');
diff --git a/src/FileFinder.php b/src/FileFinder.php
index 98e179d..88efc5a 100644
--- a/src/FileFinder.php
+++ b/src/FileFinder.php
@@ -485,7 +485,7 @@ public function getChildren()
                 }
             }
 
-            public function rewind()
+            public function rewind(): void
             {
                 if (false === $this->isRewindable()) {
                     return;
@@ -501,8 +501,8 @@ public function isRewindable()
                 }
 
                 if (false !== $stream = @opendir($this->getPath())) {
-                    $infoS = stream_get_meta_data($stream);
-                    closedir($stream);
+                    $infoS = \stream_get_meta_data($stream);
+                    \closedir($stream);
 
                     if ($infoS['seekable']) {
                         return $this->rewindable = true;
@@ -522,7 +522,7 @@ public function isRewindable()
 
                 public function __construct(\RecursiveIterator $iterator, array $excludes)
                 {
-                    $this->excludes = array_flip($excludes);
+                    $this->excludes = \array_flip($excludes);
                     $this->iterator = $iterator;
 
                     parent::__construct($iterator);
@@ -598,14 +598,14 @@ public function accept(): bool
                     $pathname = $this->current()->getFilename();
 
                     foreach ($this->notNames as $not) {
-                        if (fnmatch($not, $pathname)) {
+                        if (\fnmatch($not, $pathname)) {
                             return false;
                         }
                     }
 
                     if ($this->names) {
                         foreach ($this->names as $need) {
-                            if (fnmatch($need, $pathname)) {
+                            if (\fnmatch($need, $pathname)) {
                                 return true;
                             }
                         }
@@ -665,14 +665,14 @@ public function accept(): bool
                     }
 
                     foreach ($this->notPaths as $not) {
-                        if (fnmatch($not, $pathname)) {
+                        if (\fnmatch($not, $pathname)) {
                             return false;
                         }
                     }
 
                     if ($this->paths) {
                         foreach ($this->paths as $need) {
-                            if (fnmatch($need, $pathname)) {
+                            if (\fnmatch($need, $pathname)) {
                                 return true;
                             }
                         }
diff --git a/src/FileSystem.php b/src/FileSystem.php
index e6cd7c3..fcc6b10 100644
--- a/src/FileSystem.php
+++ b/src/FileSystem.php
@@ -116,7 +116,7 @@ public static function exists(string $file, $type = null)
      * @throws FileNotFoundException
      * @throws \InvalidArgumentException
      */
-    public static function check(string $file, $ext = null)
+    public static function check(string $file, $ext = null): void
     {
         if (!$file || !file_exists($file)) {
             throw new FileNotFoundException("File {$file} not exists！");
@@ -142,7 +142,7 @@ public static function check(string $file, $ext = null)
      * @throws IOException When target file or directory already exists
      * @throws IOException When origin cannot be renamed
      */
-    public static function rename(string $origin, string $target, bool $overwrite = false)
+    public static function rename(string $origin, string $target, bool $overwrite = false): void
     {
         // we check that target does not exist
         if (!$overwrite && static::isReadable($target)) {
@@ -176,7 +176,7 @@ public static function isReadable(string $filename): bool
      * @param int                       $mode The directory mode
      * @throws IOException On any directory creation failure
      */
-    public static function mkdir($dirs, $mode = 0777)
+    public static function mkdir($dirs, $mode = 0777): void
     {
         foreach (Arr::toIterator($dirs) as $dir) {
             if (is_dir($dir)) {
@@ -207,7 +207,7 @@ public static function mkdir($dirs, $mode = 0777)
      * @param bool                      $recursive Whether change the mod recursively or not
      * @throws IOException When the change fail
      */
-    public static function chmod($files, $mode, $umask = 0000, $recursive = false)
+    public static function chmod($files, $mode, $umask = 0000, $recursive = false): void
     {
         foreach (Arr::toIterator($files) as $file) {
             if (true !== @chmod($file, $mode & ~$umask)) {
@@ -228,7 +228,7 @@ public static function chmod($files, $mode, $umask = 0000, $recursive = false)
      * @param bool                      $recursive Whether change the owner recursively or not
      * @throws IOException When the change fail
      */
-    public static function chown($files, string $user, $recursive = false)
+    public static function chown($files, string $user, $recursive = false): void
     {
         foreach (Arr::toIterator($files) as $file) {
             if ($recursive && is_dir($file) && !is_link($file)) {
diff --git a/src/ModifyWatcher.php b/src/ModifyWatcher.php
index 3df58ba..4715666 100644
--- a/src/ModifyWatcher.php
+++ b/src/ModifyWatcher.php
@@ -225,7 +225,7 @@ public function calcMd5Hash(): string
     /**
      * @param string $watchDir
      */
-    private function collectDirMd5(string $watchDir)
+    private function collectDirMd5(string $watchDir): void
     {
         $files = scandir($watchDir, 0);
 
@@ -275,7 +275,7 @@ private function collectDirMd5(string $watchDir)
     /**
      * @return string|null
      */
-    public function getIdFile()
+    public function getIdFile(): ?string
     {
         return $this->idFile;
     }
@@ -283,7 +283,7 @@ public function getIdFile()
     /**
      * @return string|null
      */
-    public function getWatchDir()
+    public function getWatchDir(): ?string
     {
         return $this->watchDirs;
     }
@@ -291,7 +291,7 @@ public function getWatchDir()
     /**
      * @return string|null
      */
-    public function getDirMd5()
+    public function getDirMd5(): ?string
     {
         return $this->dirMd5;
     }