how to read a subfolder content?

Hi all. Here i have a small script that reads content of a folder and prints it name out. But the problem is that if i have a subfolder like this /mp3/andy/ it does not read and print the content of that folder. Is there a way to over come this problem?Thanks

Code:

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<?php
$folder=dir("./mp3");

while($folderEntry=$folder->read()){
echo $folderEntry."<br>";
}

$folder->close();

?>

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Thanks