up: update some find logic and update some util method

Author: inhere

src/Extra/FileFinder.php

@@ -726,6 +726,7 @@ public function hasChildren(bool $allowLinks = false): bool
                 if (!$this->recursive) {
                     return false;
                 }
+
                 return parent::hasChildren($allowLinks);
             }
 
@@ -743,7 +744,8 @@ public function getChildren(): RecursiveDirectoryIterator
                     return $children;
                 } catch (UnexpectedValueException $e) {
                     if ($this->skipUnreadableDirs) {
-                        return new RecursiveArrayIterator([]);
+                        return $this;
+                        // return null;
                         // return new RecursiveDirectoryIterator([]);
                     }
 

src/FileSystem.php

@@ -201,6 +201,9 @@ public static function joinPath(string $basePath, string ...$subPaths): string
         if (!$subPaths) {
             return $basePath;
         }
+        if (!$basePath) {
+            return implode(DIRECTORY_SEPARATOR, $subPaths);
+        }
 
         return $basePath . DIRECTORY_SEPARATOR . implode(DIRECTORY_SEPARATOR, $subPaths);
     }
@@ -253,15 +256,26 @@ public static function assertIsDir(string $dirPath): void
         }
     }
 
+    /**
+     * @param string $file
+     * @param string $type
+     *
+     * @return bool
+     */
+    public static function exists(string $file, string $type = ''): bool
+    {
+        return self::isExists($file, $type);
+    }
+
     /**
      * 检查文件/夹/链接是否存在
      *
      * @param string $file 要检查的目标
-     * @param string $type
+     * @param string $type file, dir, link
      *
      * @return bool
      */
-    public static function exists(string $file, string $type = ''): bool
+    public static function isExists(string $file, string $type = ''): bool
     {
         if (!$type) {
             return file_exists($file);