=============READ ME BEFORE USE============
For any issue contact: firstname.lastname@example.org
It is a beta version of my script.
Just download this php script.
// for downloading single video as mp3
Open index.php file
Look at the first line
// YOUTUBE VIDEO ID
$id = 'lF-jPBnZ098';
For converting multiple videos as MP3 file.
// MULTIPLE YOUTUBE VIDEO ID's SEPARATED BY COMMNA (,)
$ids = 'lF-jPBnZ098,OmAlu5T44t8,GTJHrHHAElU';
All you need to do is to change the $id variable value with the desired video id that you want to download as mp3.
If you have php installed on your server/localhost then you we'll get result on the webpage.