php使用递归计算目录大小

php使用递归计算目录大小,主要使用filesize函数配合递归函数的方法来实现,具体实现源代码如下：

<?php
   function directory_size($directory) {
      $directorySize=0;
      if ($dh = @opendir($directory)) {
         while (($filename = readdir ($dh))) {
           if ($filename != \".\" && $filename != \"..\") {
             if (is_file($directory.\"/\".$filename)){
                $directorySize += filesize($directory.\"/\".$filename);
             }   
             if (is_dir($directory.\"/\".$filename)){
                $directorySize += directory_size($directory.\"/\".$filename);
             }
           }
        }
      }
      @closedir($dh);
      return $directorySize;
  }

   $directory = \"./\";
   $totalSize = round((directory_size($directory) / 1024), 2);
   echo \"Directory $directory: \".$totalSize. \"kb.\";

?>