PHP与MySQL程序设计 第四版 第十章 处理文件和操作系统 笔记

basename('zhangxingju.com/zhxj/aju/test.txt'); //test.txt
basename('zhangxingju.com/zhxj/aju/test.txt','.txt'); //test

dirname('zhangxingju.com/zhxj/aju/test.txt'); //zhangxingju.com/zhxj/aju
dirname(__FILE__); // /mnt/hgfs/www/zhangxingju

pathinfo('zhangxingju.com/zhxj/aju/test.txt')
array(4) {
["dirname"]=>
string(24) "zhangxingju.com/zhxj/aju"
["basename"]=>
string(8) "test.txt"
["extension"]=>
string(3) "txt"
["filename"]=>
string(4) "test"
}

disk_free_space('tmp'); //9753321472

disk_total_space('tmp'); //16800718848

function directorySize($directory)
{
    $directorySize = 0;

    //打开目录读取内容
    if ($dh = @opendir($directory)) {

        //迭代处理每个目录项
        while (($filename = readdir($dh))) {

            //过滤掉一些目录项
            if ($filename != "." && $filename != "..") {

                //文件，确定大小并添加到总大小
                if (is_file($directory . "/" . $filename)) {
                    $directorySize += filesize($directory . "/" . $filename);
                }

                //新目录，开始递归
                if (is_dir($directory . "/" . $filename)) {
                    $directorySize += directorySize($directory . "/" . $filename);
                }
            }
        }
    }
    @closedir($dh);
    return $directorySize;
}

$dir="/www/zhangxingju.com/";
$totalsize=round((directorySize($dir)/1048576),2);
echo $totalsize.'MB';    //0.04MB