PHP: convert a YouTube URL into an iframe embed

This PHP function takes a YouTube embed link. E.g.:

https://www.youtube.com/embed/idGoesHere

And converts it into an iframe that embeds the YouTube video. This can be a great timesaver for your clients. All you do is pass your $content (which should be HTML) and all parsed YouTube URLs will be converted in the returned string.

function iframeFromYouTube($content) {

    $pattern = '/https?:\/\/(www\.)?youtube\.com\/watch\?v=([a-zA-Z0-9_-]+)/';
    
    $callback = function($matches) {

        $videoID	= $matches[2];
        $embedURL 	= "https://www.youtube.com/embed/" . $videoID; 

        return '<p><iframe data-cubed-video-ratio="16:9" style="width: 100%;" width="560" height="315" src="' . $embedURL . '" frameborder="0" allowfullscreen></iframe></p>';

    };
    
    $content = preg_replace_callback($pattern, $callback, $content);
    
    return $content;

}