PHP源码学习：将目录下的文件按照上传/修改的最近时间排序

<?php  

function judge($i, $filename, $time, $m) { 
if ($i == $m) { 
while(list($key, $value)= each($filename)) { 
$filename[$key] = $value; //echo $filename[$key]."<br>"; 
} 
while(list($key, $value) = each($time)) { $time[$key] = $value; //echo $time[$key]."<BR>";  } 
} 
for ($j = 0; $j < $i; $j++) { 
if ($time[$j] > $max) { 
$max = $time[$j]; 
$sign = $j; 
} 
if ($j == ($i-1)) { 
echo $filename[$sign]." ʱ¼äÖµ£º".$time [$sign]."<br>"; 
if($sign < $j) { $time[$sign] = $time[$j]; 
$filename[$sign] = $filename[$j]; 
} 
judge($i-1, $filename, $time, $m); 
} 
} 
}  

function list_file($path, $mode = 1) {  
$handle = opendir($path); 
while ($file = readdir($handle)) { 
$length = strpos($file, "."); 
if ($length) { static $i = 0; 
$time[$i] = fileatime($file); 
$filename[$i] = $file; //echo $filename[$i].$time[$i]."<BR>"; $i++; 
} 
} $m = $i; 
judge($i, $filename, $time, $m);  
}  
list_file("."); 

?>