PHP remote file management, can sort tables, traverse directories, and sort by time

<?php 
$rootdir="./"; 
$spacenum=0; 
$filenum=0; 
$allfilesize=0; 
echo "<h1>文件管理调试测试</h1>"; 
echo "<a href=&#39;&#39;>重置</a>"; 
readLogDir($rootdir); 
echo "<hr>"; 
echo "Total files count: $filenum.<br>"; 
echo "Total disk space used: $allfilesize<br>"; 
$freespace=diskfreespace("/"); 
echo "residue disk space: $freespace<br>"; 
function readLogDir($subdir){ 
global $rootdir,$spacenum,$filenum,$allfilesize; 
@chdir($subdir) or die ("error:could not change to this directory!"); 
$dirobject=dir($subdir); 
echo "<table width=600 border=0 align=&#39;center&#39; id=&#39;clearStart&#39;><tr id=&#39;ignore&#39; ><td width=40% onclick=&#39;JM_PowerList(0)&#39;><b>文件名</b></a></td><td width=20% onclick=&#39;JM_PowerList(1)&#39;><b>文件大小</b></td><td width=40% onclick=&#39;JM_PowerList(2)&#39;><b>创建时间</b></td></tr>"; 
$i=0; 
while ($file=$dirobject->read()){ 
if($file=="." || $file==".."){ 
continue; 
} 
$i=$i+1; 
echo "<tr bgcolor=&#39;#e0e0e0&#39;><td>".$i."<a href=.php?file_dir=".$rootdir."&file_name=".$file." target=_blank>"; 
echo $file."</a></td><td>". number_format((filesize($file)/1024),2,&#39;.&#39;,&#39;&#39;)."KB</td><td>". date("Y-m-d H:i:s", filemtime($file)). "</td></tr>"; 
$allfilesize+=filesize($file); 
$filenum++; 
} 
echo "</table>"; 
return; 
} 
?> 
<script src="table_sort.js"></script> 
需要的JS文件 
/** 
* table排序 
* anthor liueh 
*/ 
function JM_PowerList(colNum) 
{ 
headEventObject=event.srcElement;//取得引发事件的对象 
while(headEventObject.tagName!="TR") //不是tr行,则从底下的td冒泡上来寻找到相应行 
{ 
headEventObject=headEventObject.parentElement; 
} 
for (i=0;i<headEventObject.children.length;i++) 
{ 
if (headEventObject.children[i]!=event.srcElement)//找到事件发生的td单元格 
{ 
headEventObject.children[i].className=&#39;listTableHead&#39;;//把点击的列的className属性设为listTableHead 
} 
} 
var tableRows=0; 
trObject=clearStart.children[0].children; //取得表格中行对象, 原来这里叫DataTable, 可能是你写错了吧?? 
for (i=0;i<trObject.length;i++) 
{ 
Object=clearStart.children[0].children[i];//取得每行的对象 
tableRows=(trObject[i].id==&#39;ignore&#39;)?tableRows:tableRows+1;//如果不是忽略行,则行数加一 
} 
var trinnerHTML=new Array(tableRows); 
var tdinnerHTML=new Array(tableRows); 
var tdNumber=new Array(tableRows) 
var i0=0 
var i1=0 
for (i=0;i<trObject.length;i++) 
{ 
if (trObject[i].id!=&#39;ignore&#39;) 
{ 
trinnerHTML[i0]=trObject[i].innerHTML;//把行放在数组里 
tdinnerHTML[i0]=trObject[i].children[colNum].innerHTML;//把要排序的行中td的内容放数组里 
tdNumber[i0]=i;//行号 
i0++;//加一,下个循环用 
} 
} 
sourceHTML=clearStart.children[0].outerHTML;//取得表格中所有tr的html代码 
//对所有td中的字符串进行排序, 算不算冒泡排序??? 
for (bi=0;bi<tableRows;bi++) 
{ 
for (i=0;i<tableRows;i++) 
{ 
if(tdinnerHTML[i]>tdinnerHTML[i+1]) 
{ 
t_s=tdNumber[i+1]; 
t_b=tdNumber[i]; 
tdNumber[i+1]=t_b; 
tdNumber[i]=t_s; 
temp_small=tdinnerHTML[i+1]; 
temp_big=tdinnerHTML[i]; 
tdinnerHTML[i+1]=temp_big; 
tdinnerHTML[i]=temp_small; 
} 
} 
} 
var showshow=&#39;&#39;; 
var numshow=&#39;&#39;; 
for (i=0;i<tableRows;i++) 
{ 
showshow=showshow+tdinnerHTML[i]+&#39;\n&#39;;//把排序好的td的内容存在showshow字串里 
numshow=numshow+tdNumber[i]+&#39;|&#39;; //把排序好的相应的行号也存在numshow中 
} 
sourceHTML_head=sourceHTML.split("<TBODY>");//从<TBODY>截断,我试了,前头串为空 
numshow=numshow.split("|"); 
var trRebuildHTML=&#39;&#39;; 
if (event.srcElement.className==&#39;listHeadClicked&#39;) 
{//已点击的列, 则逆排 
for (i=0;i<tableRows;i++) 
{ 
trRebuildHTML=trRebuildHTML+trObject[numshow[tableRows-1-i]].outerHTML;//取出排序好的tr的内容连接起来 
} 
event.srcElement.className=&#39;listHeadClicked0&#39;; 
} 
else 
{//默认顺排,新点击顺排 
for (i=0;i<tableRows;i++) 
{ 
trRebuildHTML=trRebuildHTML+trObject[numshow[i]].outerHTML; 
} 
event.srcElement.className=&#39;listHeadClicked&#39;; 
} 
//取得排序后的tr集合结果字符串 
var DataRebuildTable=&#39;&#39;; 
//把旧的表格头和新的tr排序好的元素连接起来, (修改了一下) 
DataRebuildTable = "<table border=0 width=600 id=&#39;clearStart&#39; align=&#39;center&#39;><TBODY>" + trObject[0].outerHTML + trRebuildHTML + "</TBODY>" + 
"</table>"; 
clearStart.outerHTML=DataRebuildTable;//表格用新串重新写一次 
}

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