Download youtube videos as mp3 with using youtube-mp3.org

EXAMPLE URL : http://www.youtube.com/watch?v=ydRAb9cwHnA
EXAMPLE URL ID : ydRAb9cwHnA

$MP3 = new youtubemp3("ydRAb9cwHnA");
$MYFILE = $MP3->convert();

Optional data ( Never use with download function! )
print_r($MYFILE->fileInfo);

$MYFILE->download();
tadaaa! Your MP3 file downloaded...

You can use this way
$MP3->convert()->download();
because this class have a fluent interface.