php使用递归计算文件夹大小

protected function dir_size($dir){
??????? $dh = opendir($dir);???????????? //打开目录,返回一个目录流
??????? $size = 0;????? //初始年夜小为0
??????? while(false !== ($file = @readdir($dh))){???? //循环读取目录下的文件
?????????? if($file!='.' and $file!='..'){
??????????? $path = $dir.'/'.$file;???? //设置目录,用于含有子目录的情况
??????????????? if(is_dir($path)){
??????????????? $size += $this->dir_size($path);? //递归调用,计算目录年夜小
??????????????? }elseif(is_file($path)){
??????????????????? $size += filesize($path);?? //计算文件年夜小
??????????????? }
??????????? }
??????? }??
??????? closedir($dh);???????????? //关闭目录流
??????? return $size;?????????????? //返回年夜小
??? }