adactio

<?php

# Licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
# http://creativecommons.org/publicdomain/zero/1.0/

function ampify($html='') {

    # Replace img, audio, and video elements with amp custom elements
    $html = str_ireplace(
        ['<img','<video','/video>','<audio','/audio>'],