PHP Function to Convert Youtube and Vimeo URLs to Lightbox-Ready Equivalents

youtube-vimeo-embed-urls.php

<?php
/**
 * Given a string containing any combination of YouTube and Vimeo video URLs in
 * a variety of formats (iframe, shortened, etc), each separated by a line break,
 * parse the video string and determine it's valid embeddable URL for usage in
 * popular JavaScript lightbox plugins.
 *
 * In addition, this handler grabs both the maximize size and thumbnail versions
 * of video images for your general consumption. In the case of Vimeo, you must
 * have the ability to make remote calls using file_get_contents(), which may be
 * a problem on shared hosts.
 *
 * Data gets returned in the format:
 *
 * array(
 *   array(
 *     'url' => 'http://path.to/embeddable/video',
 *     'thumbnail' => 'http://path.to/thumbnail/image.jpg',
 *     'fullsize' => 'http://path.to/fullsize/image.jpg',
 *   )
 * )
 *
 * @param       string  $videoString
 * @return      array   An array of video metadata if found
 *
 * @author      Corey Ballou http://coreyballou.com
 * @copyright   (c) 2012 Skookum Digital Works http://skookum.com
 * @license     
 */
function parseVideos($videoString = null)
{
    // return data
    $videos = array();

    if (!empty($videoString)) {

        // split on line breaks
        $videoString = stripslashes(trim($videoString));
        $videoString = explode("\n", $videoString);
        $videoString = array_filter($videoString, 'trim');

        // check each video for proper formatting
        foreach ($videoString as $video) {

            // check for iframe to get the video url
            if (strpos($video, 'iframe') !== FALSE) {
                // retrieve the video url
                $anchorRegex = '/src="(.*)?"/isU';
                $results = array();
                if (preg_match($anchorRegex, $video, $results)) {
                    $link = trim($results[1]);
                }
            } else {
                // we already have a url
                $link = $video;
            }

            // if we have a URL, parse it down
            if (!empty($link)) {

                // initial values
                $video_id = NULL;
                $videoIdRegex = NULL;
                $results = array();

                // check for type of youtube link
                if (strpos($link, 'youtu') !== FALSE) {
                    if (strpos($link, 'youtube.com') !== FALSE) {
                        // works on:
                        // http://www.youtube.com/embed/VIDEOID
                        // http://www.youtube.com/embed/VIDEOID?modestbranding=1&amp;rel=0
                        // http://www.youtube.com/v/VIDEO-ID?fs=1&amp;hl=en_US
                        $videoIdRegex = '/youtube.com\/(?:embed|v){1}\/([a-zA-Z0-9_]+)\??/i';
                    } else if (strpos($link, 'youtu.be') !== FALSE) {
                        // works on:
                        // http://youtu.be/daro6K6mym8
                        $videoIdRegex = '/youtu.be\/([a-zA-Z0-9_]+)\??/i';
                    }

                    if ($videoIdRegex !== NULL) {
                        if (preg_match($videoIdRegex, $link, $results)) {
                            $video_str = 'http://www.youtube.com/v/%s?fs=1&amp;autoplay=1';
                            $thumbnail_str = 'http://img.youtube.com/vi/%s/2.jpg';
                            $fullsize_str = 'http://img.youtube.com/vi/%s/0.jpg';
                            $video_id = $results[1];
                        }
                    }
                }

                // handle vimeo videos
                else if (strpos($video, 'vimeo') !== FALSE) {
                    if (strpos($video, 'player.vimeo.com') !== FALSE) {
                        // works on:
                        // http://player.vimeo.com/video/37985580?title=0&amp;byline=0&amp;portrait=0
                        $videoIdRegex = '/player.vimeo.com\/video\/([0-9]+)\??/i';
                    } else {
                        // works on:
                        // http://vimeo.com/37985580
                        $videoIdRegex = '/vimeo.com\/([0-9]+)\??/i';
                    }

                    if ($videoIdRegex !== NULL) {
                        if (preg_match($videoIdRegex, $link, $results)) {
                            $video_id = $results[1];

                            // get the thumbnail
                            try {
                                $hash = unserialize(file_get_contents("http://vimeo.com/api/v2/video/$video_id.php"));
                                if (!empty($hash) && is_array($hash)) {
                                    $video_str = 'http://vimeo.com/moogaloop.swf?clip_id=%s';
                                    $thumbnail_str = $hash[0]['thumbnail_small'];
                                    $fullsize_str = $hash[0]['thumbnail_large'];
                                } else {
                                    // don't use, couldn't find what we need
                                    unset($video_id);
                                }
                            } catch (Exception $e) {
                                unset($video_id);
                            }
                        }
                    }
                }

                // check if we have a video id, if so, add the video metadata
                if (!empty($video_id)) {
                    // add to return
                    $videos[] = array(
                        'url' => sprintf($video_str, $video_id),
                        'thumbnail' => sprintf($thumbnail_str, $video_id),
                        'fullsize' => sprintf($fullsize_str, $video_id)
                    );
                }
            }

        }

    }

    // return array of parsed videos
    return $videos;
}