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Code:
<?php
function genRandomString($len)
{
$chars = array(
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", 
"l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", 
"w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", 
"H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", 
"S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2", 
"3", "4", "5", "6", "7", "8", "9"
);
$charsLen = count($chars) - 1;
shuffle($chars);    // ½«Êý×é´òÂÒ
$output = "";
for ($i=0; $i<$len; $i++)
{
$output .= $chars[mt_rand(0, $charsLen)];
}
return $output;
}
$str = genRandomString(4); //ÊäÈëÒªÊäÈëµÄËæ»úÊýµÄ¸öÊý£»
$str .= "<br />";
$str .= genRandomString(4);
$str .= "<br />";
$str .= genRandomString(4);
echo $str;
?>


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<?php
$base_dir="filelist/";
$fso=opendir($base_dir);
echo  $base_dir."<hr/>";
whil ......
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