Now returns video metadata instead of an embeddable URL

parse-youtube-vimeo-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 host and ID.
 *
 * Data gets returned in the format:
 *
 * array(
 *   array(
 *     'host' => 'youtube' | 'vimeo',
 *     'id' => <video_id>,
 *   )
 * )
 *
 * @param       string  $videoString
 * @return      array   An array of video metadata if found
 *
 * @author      Corey Ballou http://coreyballou.com
 * @copyright   (c) 2012 Skookum Digital Works http://skookum.com
 * 
 * @modified    Prateek Rungta http://prateekrungta.com
 *              - Improved YouTube extraction
 *              - Dropped thumbnail referencing/fetching
 *              - Now returns the video metadata instead of generating a URL
 * 
 */
function parseVideos($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;
                $video_host = NULL;
                $videoIdRegex = NULL;
                $results = array();
                
                // check for type of youtube link
                if (strpos($link, 'youtu') !== FALSE) {
                    if (strpos($link, 'youtube.com') !== FALSE) {
                        if (strpos($link, 'watch') !== FALSE) {
                          // works on:
                          // http://www.youtube.com/watch?feature=player_embedded&v=VIDEOID#!
                          $videoIdRegex = '!v=([a-z0-9_-]+)!i';
                        } else {
                          // 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_id = $results[1];
                            $video_host = 'youtube';
                        }
                    }
                }
                
                // 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];
                            $video_host = 'vimeo';
                        }
                    }
                }
                
                // check if we have a video id, if so, add the video metadata
                if (!empty($video_id)) {
                    // add to return
                    $videos[] = array(
                        'host' => $video_host,
                        'id' => $video_id,
                    );
                }
            }
            
        }
        
    }
    
    // return array of parsed videos
    return $videos;
}