PHP中确定目录大小的相关问题代码

<code><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><span><?php
    function directory_size<span>(<span>$address</span>)</span>  //address传入文件路径
    {
        <span>$size</span>=<span>0</span>;//初始化文件大小变量
        if<span>(<span>$dir</span>=@opendir<span>(<span>$address</span>)</span>)</span>  //如果正常打开文件则进行下一步操作
        {
            while<span>(<span>$filename</span>=readdir<span>(<span>$dir</span>)</span>)</span>
            {
                if<span>(<span>$filename</span>!=<span>"."</span>&&<span>$filename</span>!=<span>".."</span>)</span>
                {
                    if<span>(is_file<span>(<span>$address</span>.<span>"\"</span>.<span>$filename</span>)</span>)</span>
                    {
                        <span>$size</span>+=filesize<span>(<span>$address</span>.<span>"\"</span>.<span>$filename</span>)</span>;
                    }
                    if<span>(is_dir<span>(<span>$address</span>.<span>"\"</span>.<span>$filename</span>)</span>)</span>                    {
                        <span>$size</span>+=directory_size<span>(<span>$address</span>.<span>"\"</span>.<span>$filename</span>)</span>;
                    }
                }
            }
        }
        @closedir<span>(<span>$dir</span>)</span>;
        return <span>$size</span>;
    }

    <span>$dire_address</span>=<span>"F:course"</span>;
    <span>$totalsize</span>=directory_size<span>(<span>$dire_address</span>)</span>;
    printf<span>(<span>"%s"</span>,<span>$totalsize</span>)</span>;


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