PHP Code Snippets: Working With YouTube

gistfile1.php

/**
 * Get YouTube Video ID by YouTube URL
 * 
 * @param string YouTube video URL
 * 
 * @return string YouTube video ID
 */
function get_youtube_id_by_url( $url ){
    // Parse URL
    $parsed_url = parse_url($url);
    
    // Get query string values
    parse_str($parsed_url['query'], $querystrings);
	
    // Return video ID
    return $querystrings['v'];
}

/**
 * Get YouTube video thumb based on YouTube video ID
 * 
 * @param string YouTube video id
 * @param string YouTube thumb size
 * 
 * @return string YouTube video thumb
 */
function get_youtube_thumb_by_id( $video_id, $size = 'default' ){
    switch($size){
        case 'high':
            $resolution = 'hqdefault';
            break;
        case 'middle':
            $resolution = 'mqdefault';
            break;
        default :
            $resolution = 'default';
            break;
    }
    
    return "http://img.youtube.com/vi/$video_id/$resolution.jpg";
}

/**
 * Get YouTube thumb by url
 * 
 * @param string YouTube video URL
 * @param string YouTube video thumb size
 * 
 * @return string YouTube video thumb
 */
function get_youtube_thumb_by_url( $url, $size = 'default' ){
    return get_youtube_thumb_by_id( get_youtube_id_by_url( $url ), $size );
}