omit-twitter-script-oembed.php

<?php 
function omit_twitter_script($provider, $url, $args) {
    //get the hostname of the oEmbed endpoint provider being called
    $host = parse_url($provider, PHP_URL_HOST);
    //check to see that hostname is twitter.com
    if (strpos($host, 'twitter.com') !== false) {
      //adding ?omit_script=true to oEmbed endpoint call stops the returned HTML from containing widgets.js
        $provider = add_query_arg('omit_script', 'true', $provider);
    }
    //return the $provider URL so the oEmbed can be fetched
    return $provider;
}
add_filter('oembed_fetch_url', 'omit_twitter_script', 10, 3);