Hide Youtube related videos from other channels - WP oEmbed

wp-hide-youtube-related-videos.php

<?php
/**
 * overrides default wp oembed functionality for youtube
 * Hide Youtube related videos from other channels
 * only shows from same channel
 * @param $html
 * @param $url
 * @param $args
 * @return string
 */
function dctit_youtube_oembed_related_videos( $html, $url, $args ) {
    $url_string = parse_url( $url, PHP_URL_QUERY );
    parse_str( $url_string, $id );

    if ( isset( $id['v'] ) ) {
        return '<iframe width="'.$args['width'].'" height="'.$args['height'].'" src="//www.youtube.com/embed/'.$id['v'].'?rel=0" frameborder="0" allowfullscreen></iframe>';
    }
    return $html;
}
add_filter( 'oembed_result', 'dctit_youtube_oembed_related_videos', 10, 3 );