谁能给这个简单的php加上详细注释

[waitingmyself]

<?
// from php manual page
function formatBytes($val, $digits = 3, $mode = "SI", $bB = "B"){ //$mode == "SI"|"IEC", $bB == "b"|"B"
$si = array("", "K", "M", "G", "T", "P", "E", "Z", "Y");
$iec = array("", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi");
switch(strtoupper($mode)) {
case "SI" : $factor = 1000; $symbols = $si; break;
case "IEC" : $factor = 1024; $symbols = $iec; break;
default : $factor = 1000; $symbols = $si; break;
}
switch($bB) {
case "b" : $val *= 8; break;
default : $bB = "B"; break;
}
for($i=0;$i<count($symbols)-1 && $val>=$factor;$i++)
$val /= $factor;
$p = strpos($val, ".");
if($p !== false && $p > $digits) $val = round($val);
elseif($p !== false) $val = round($val, $digits-$p);
return round($val, $digits) . " " . $symbols[$i] . $bB;
}


$dir = $_REQUEST['lib'] == 'yui' ? '../../../' : '../../';
$node = $_REQUEST['node'];
if(strpos($node, '..') !== false){
die('Nice try buddy.');
}

$nodes = array();
$d = dir($dir.$node);
while($f = $d->read()){
if($f == '.' || $f == '..' || substr($f, 0, 1) == '.')continue;
$lastmod = date('M j, Y, g:i a',filemtime($dir.$node.'/'.$f));
if(is_dir($dir.$node.'/'.$f)){
$qtip = 'Type: Folder<br />Last Modified: '.$lastmod;
$nodes[] = array('text'=>$f, id=>$node.'/'.$f, qtip=>$qtip, iconCls=>'folder', allowDrag=>false);
}else{
$size = formatBytes(filesize($dir.$node.'/'.$f), 2);
$qtip = 'Type: JavaScript File<br />Last Modified: '.$lastmod.'<br />Size: '.$size;
$nodes[] = array('text'=>$f, id=>$node.'/'.$f, leaf=>true, qtip=>$qtip, qtipTitle=>$f, cls=>'file');
}
}
$d->close();
echo json_encode($nodes);
?>

[waitingmyself]

大概写一下就可以了,应该不是很难的程序,我没学过php,有asp/java/c的基础.

[li1229363]

你的是一个完整程序的部分。里面很多函数都是自定义的，不是php本身的函数，你让被人怎么帮你？那些函数到底干什么的又不是我们能够猜出来的啊！

[wasuka]

哪行？

[li1229363]

晕了，这个怎么注释？

感觉里面有问题……