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PHP统计目录大小的自定义函数分享_PHP

May 31, 2016 pm 07:27 PM
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计算文件、磁盘分区和目录的大小在各种应用程序中都是常见的任务。计算文件的大小可以通过前面介绍过的filesize()函数完成,统计磁盘大小也可以使用disk_free_space()和disk_total_space()两个函数实现。但PHP目前并没有提供目录总大小的标准函数,因此我们要自定义一个函数来完成这个任务。首先要考虑计算的目录中有没有包含其他子目录的情况,如果没有子目录,目录下所有文件的大小相加后的总和就是这个目录的大小。如果包含子目录,就按照这个方法再计算一下子目录的大小,使用递归函数看来最适合此项任务。计算目录大小的自定义函数如下所示:

代码如下:


//自定义一个函数dirSize(),统计传入参数的目录大小
function dirSize($directory){
  $dir_size = 0; //用来累加各个文件大小
 
  if($dir_handle = @opendir($directory)){      //打开目录,并判断是否能成功打开
    while($filename = readdir($dir_handle)){     //循环遍历目录下的所有文件
        if($filename != "."&& $filename != ".."){     //一定要排除两个特殊的目录
            $subFile = $directory."/".$filename;     //将目录下的子文件和当前目录相连
            if(is_dir($subFile))     //如果为目录
            $dir_size += dirSize($subFile);     //递归地调用自身函数,求子目录的大小
            if(is_file($subFile))     //如果是文件
            $dir_size += filesize($subFile);     //求出文件的大小并累加
        }
    }
    closedir($dir_handle);      //关闭文件资源
    return $dir_size;     //返回计算后的目录大小
  }
}
 
$dir_size = dirSize("phpMyAdmin");    //调用该函数计算目录大小
echo round($dir_size/pow(1024,1),2)."KB";    //字节数转换为“KB”单位并输出
?>

也可以使用exec()或system()函数调用操作系统命令“du”来返回目录的大小。但出于安全原因,这些函数通常是禁用的,而且不利于跨平台操作。

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