php验证session语句

if(!isset($_SESSION[controller]))

echo "";

if($_SERVER['HTTP_REFERER'] == "")

echo "";

echo "";

?>

//返回文件夹下的文件列表

function show_file(){

$folder_name = "../bak";

$d_open = opendir($folder_name);

$num = 0;

while($file = readdir($d_open)){

$filename[$num] = $file;

$num++; 

}

closedir($d_open);

return $filename;

}

下拉列表例子；

$filename = show_file();

for($num = 2;$num

?>

}

?>

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