Add parameters vimeo videos using wordpress embeds

There are several filters in WordPress for altering oEmbed data, depending on when you need to modify the results:

1. embed_handler_html
   Filters the returned embed handler.
2. embed_oembed_html
   Filters the cached oEmbed HTML.
3. oembed_result
   Filters the HTML returned by the oEmbed provider.

Choose the one that best suits your needs, but keep in mind that each filter acts on data at a different stage of the oEmbed process and could have performance implications.

For instance, embed_handler_html is called before data is put in the oEmbed / wp_postmeta cache (so only once per external embed) while embed_oembed_html is called after retrieving the oEmbed cache (so every time the item is displayed).

If you only need to modify the oEmbed data once, oembed_result is probably your best candidate.

To answer your question, here's an example that modifies the Vimeo and YouTube embed parameters returned from the WordPress wp_oembed_get() function.

The <iframe> HTML markup is first parsed by PHP's DOMDocument class, then the embed URL is modified using WordPress' add_query_arg() function:

/**
 *
 */
add_filter( 'oembed_result', function ( $html, $url, $args ) {
    $doc = new DOMDocument();
    $doc->loadHTML( $html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD );
    $tags = $doc->getElementsByTagName( 'iframe' );

    foreach ( $tags as $tag ) {
        $iframe_src = $tag->attributes->getNamedItem('src')->value;

        if ( false !== strpos( $iframe_src, 'youtube.com' ) ) {
            // https://developers.google.com/youtube/player_parameters
            $url = add_query_arg( array(
                'autohide' => 1,
                'autoplay' => 1,
                'controls' => 2,
                'feature' => null,
                'modestbranding' => 1,
                'playsinline' => 1,
                'rel' => 0,
                'showinfo' => 0,
            ), $iframe_src );
        }

        if ( false !== strpos( $iframe_src, 'vimeo.com' ) ) {
            // https://developer.vimeo.com/player/embedding
            $url = add_query_arg( array(
                'autoplay' => 1,
                'badge' => 0,
                'byline' => 0,
                'portrait' => 0,
                'title' => 0,
            ), $iframe_src );
        }

        $tag->setAttribute( 'src', $url );

        $html = $doc->saveHTML();
    }

    return $html;
}, 10, 3 );

What I guess (didn't try) doesn't work with the other solution might be that appending to the url before asking Vimeo for the embed code might just be ignored by Vimeo.

So what I do is simply parse the response with a RegEx:

$htmlcode = preg_replace("/(http:\/\/player.vimeo.com\/video\/[0-9]*)/i", '$1?title=0&portrait=0&byline=0&color=ffffff', $htmlcode);

You can add query args to the end of the URL like so:

$videourl = add_query_arg( array('key1' => 'value1' ), $videourl ); // you can add as many as you want in key/value pairs...

$htmlcode = wp_oembed_get( $videourl );
// rest of your code...