PHPDaemon\Core\CallbackWrapper::forceWrap PHP Method

    public static function forceWrap($cb, $timeout = null)
    {
        if ($cb instanceof CallbackWrapper) {
            return $cb;
        }
        if ($cb === null) {
            return null;
        }
        return new static($cb, $timeout, Daemon::$context);
    }

 /**
  * Open file
  * @param  string   $path  Path
  * @param  string   $flags Flags
  * @param  callable $cb    Callback (File)
  * @param  integer  $mode  Mode (see EIO_S_I* constants)
  * @param  integer  $pri   Priority
  * @return resource
  */
 public static function open($path, $flags, $cb, $mode = null, $pri = EIO_PRI_DEFAULT)
 {
     $cb = CallbackWrapper::forceWrap($cb);
     if (!FileSystem::$supported) {
         $mode = File::convertFlags($flags, true);
         $fd = fopen($path, $mode);
         if (!$fd) {
             call_user_func($cb, false);
             return false;
         }
         $file = new File($fd, $path);
         call_user_func($cb, $file);
         return true;
     }
     $fdCacheKey = $path . "" . $flags;
     $noncache = strpos($flags, '!') !== false;
     $flags = File::convertFlags($flags);
     if (!$noncache && ($item = FileSystem::$fdCache->get($fdCacheKey))) {
         // cache hit
         $file = $item->getValue();
         if ($file === null) {
             // operation in progress
             $item->addListener($cb);
         } else {
             // hit
             call_user_func($cb, $file);
         }
         return null;
     } elseif (!$noncache) {
         $item = FileSystem::$fdCache->put($fdCacheKey, null);
         $item->addListener($cb);
     }
     return eio_open($path, $flags, $mode, $pri, function ($path, $fd) use($cb, $flags, $fdCacheKey, $noncache) {
         if ($fd === -1) {
             if ($noncache) {
                 call_user_func($cb, false);
             } else {
                 FileSystem::$fdCache->put($fdCacheKey, false, self::$badFDttl);
             }
             return;
         }
         $file = new File($fd, $path);
         $file->append = ($flags | EIO_O_APPEND) === $flags;
         if ($file->append) {
             $file->stat(function ($file, $stat) use($cb, $noncache, $fdCacheKey) {
                 $file->offset = $stat['size'];
                 if (!$noncache) {
                     $file->fdCacheKey = $fdCacheKey;
                     FileSystem::$fdCache->put($fdCacheKey, $file);
                 } else {
                     call_user_func($cb, $file);
                 }
             });
         } else {
             if (!$noncache) {
                 $file->fdCacheKey = $fdCacheKey;
                 FileSystem::$fdCache->put($fdCacheKey, $file);
             } else {
                 call_user_func($cb, $file);
             }
         }
     }, $path);
 }