php写的递归列出所有文件和目录的函数

/*
简单的目录递归函数
*/
function tree($directory)
{
$mydir=dir($directory);
echo "";while($file=$mydir->read()){
if((is_dir("$directory/$file")) AND ($file!=".") AND ($file!="..")){
echo "
$file";tree("$directory/$file");
}else{
echo "
$file";}
}
echo "
";
$mydir->close();
}
//start the program
echo "目录为粉红色";
tree(".");
?>