PHP遍历目录下的所有文件

<pre name="code" class="php"><?php
function scan_dir($dir){
$i = 0;
if ($handle =opendir($dir)){
while (false !==($file = readdir($handle))){
if ($file !='.'&& $file !='..'){
$fullpath = $dir.'/'.$file;
if (is_dir($fullpath)){
scandir($fullpath);
echo $fullpath;
$i++;
}else{
echo $fullpath;
$i++;
}
}
}
}
closedir($handle);
}