GitHub - coolguruji/youtube-to-mp3-converter-php-script: This youtube to mp3 converter is a full php scripts for webmasters. No requirement of FFMPEG, Youtube-dl or Dedicated/vps server.
PHP YouTube Downloader Script 2017 that Works - How to Download a Video of Any Website using a Converter from YouTube to MP4 or Convert to MP3 - PHP Classes
Convert YouTube to MP3 :: Free PHP script :: Installation Tutorial - Part #3 on Vimeo