A PHP function to return an oEmbed result from a URL.

getEmbedCode.php

<?php

function getEmbedCode($url="") {

    $return = '';

    $providers = array(
        'flickr.com'        =>    'https://www.flickr.com/services/oembed/',
        'huffduffer.com'    =>    'https://huffduffer.com/oembed',
        'instagram.com'     =>    'https://api.instagram.com/publicapi/oembed',
        'kickstarter.com'   =>    'https://www.kickstarter.com/services/oembed',
        'soundcloud.com'    =>    'https://soundcloud.com/oembed',
        'speakerdeck.com'   =>    'https://speakerdeck.com/oembed.json',
        'ted.com'           =>    'https://www.ted.com/talks/oembed.json',
        'vimeo.com'         =>    'https://vimeo.com/api/oembed.json',
        'youtube.com'       =>    'https://www.youtube.com/oembed'
    );

    $endpoint = false;

    foreach ($providers as $domain => $provider) {
        if (stristr($url,$domain)) {
            $endpoint = $provider;
            break;
        }
    }

    if (!$endpoint) {
        return $return;
    }

   $options = array(
        CURLOPT_URL => $endpoint.'?url='.urlencode($url).'&format=json&scheme=https',
        CURLOPT_USERAGENT => 'adactio.com',
        CURLOPT_TIMEOUT => 5,
        CURLOPT_RETURNTRANSFER => TRUE,
        CURLOPT_HEADER => FALSE
    );

    $curl = curl_init();
    curl_setopt_array($curl, $options);
    $result = curl_exec($curl);
    curl_close($curl);

    $response = json_decode($result,true);

    if (isset($response['html'])) {
        $find = '<iframe';
        if (isset($response['title'])) {
            $replace = '<iframe loading="lazy" title="'.$response['title'].'"';
        } else {
            $replace = '<iframe loading="lazy" title="'.$domain.'"';
        }
        $response['html']=str_replace($find,$replace,$response['html']);
    }

    if (isset($response['type'])) {
        switch ($response['type']) {
            case 'photo':
                if (isset($response['url']) && isset($response['title'])) {
                    $return = '<img src="'.$response['url'].'" alt="'.$response['title'].'" />';
                }
            break;
            default:
                $return = $response['html'];
            break;
        }
    }

    if ($response['provider_url'] == 'https://www.youtube.com/') {
        parse_str(parse_url($url, PHP_URL_QUERY), $arguments);
        $id = $arguments['v'];
        if (isset($id)) {
            $return = '<div>';
            $return.= '<a class="videoimglink" href="'.$url.'" onclick="event.preventDefault();this.parentNode.innerHTML=\'';
            $return.= '<iframe src=https://www.youtube-nocookie.com/embed/'.$id.'?autoplay=1></iframe>';
            $return.= '\';">';
            $return.= '<img width="100%" loading="lazy" src="https://i.ytimg.com/vi/'.$id.'/default.jpg" alt="'.$response['title'].'" srcset="';
            $return.= 'https://i.ytimg.com/vi/'.$id.'/mqdefault.jpg 320w,';
            $return.= 'https://i.ytimg.com/vi/'.$id.'/hqdefault.jpg 480w,';
            $return.= 'https://i.ytimg.com/vi/'.$id.'/maxresdefault.jpg 1280w';
            $return.= '">';
            $return.= '</a>';
            $return.= '</div>';
        }
    }

    return $return;

}

?>