Downloads YouTube playlists.

youtube_playlist_downloader.php

<?php

$playlist_id= 'PLzJZ3ahfm9Q_VSVXmANa8s6v99t3uRkkL';
$api_key = 'AIzaSyAL7YE_8oGFPPWJ6pgQVbAYF-G7tsbf15I';

$base_url = 'https://www.googleapis.com/youtube/v3/';
$playlist_items_url = 'playlistItems?part=contentDetails%2Csnippet&maxResults=50&playlistId='.$playlist_id.'&key='.$api_key;
$playlist_url = $base_url . 'playlists?part=contentDetails%2Csnippet&id='.$playlist_id.'&key='.$api_key;

$playlist_output = curl_get($playlist_url);
$json_playlist_info = json_decode($playlist_output, true);

$playlist_title = $json_playlist_info['items'][0]['snippet']['title'];
$playlist_title = preg_replace('/[\s]+/', '', $playlist_title);

$folder_title = '~/Movies/'.$playlist_title;
mkdir($folder_title);

$url = $base_url . $playlist_items_url;

$output = curl_get($url);
$json_youtube_videos = json_decode($output,true);
$videos = $json_youtube_videos['items'];

//print_r($json_youtube_videos);

while(isset($json_youtube_videos['nextPageToken'])){ 
    if(preg_match('/&pageToken=/', $url)){
        $exploded_url = explode('&', $url);
        foreach($exploded_url as $i => $chunk){
            if(preg_match('/pageToken=/', $chunk)){
                $exploded_url[$i] = 'pageToken='.$json_youtube_videos['nextPageToken'];
                $url = implode('&', $exploded_url);
            }
        }
    } else {
        $url = $url.'&pageToken='.$json_youtube_videos['nextPageToken'];
    }
    $output = curl_get($url);
    $json_youtube_videos = json_decode($output,true);
    $additional_videos = $json_youtube_videos['items'];
    $videos = array_merge($videos, $additional_videos);
}

//print_r(count($videos));
 
 


$video_template_url = 'http://www.youtube.com/watch?v=';
//$get_video_info = 'http://www.youtube.com/get_video_info?&video_id=';
foreach($videos as $i => $video){
    $video_id = $video['contentDetails']['videoId'];
    $resolved_video_url = $video_template_url. $video_id;
    $video_title = $video['snippet']['title'];

    //echo $video_url .PHP_EOL.implode('', explode(' ', $video_title)).PHP_EOL.PHP_EOL;
    
    echo "Downloading... ".$video_title.PHP_EOL;
    $video_title = preg_replace('/[\s]+/', '', $video_title);
    $output_file = $folder_title . '/'. $video_title;
    exec("youtube-dl -o ".$output_file.".mp4 '".$resolved_video_url."'");
}


function curl_get($URL) {
    $ch = curl_init();
    $timeout = 3;
    curl_setopt( $ch , CURLOPT_URL , $URL );
    curl_setopt( $ch , CURLOPT_RETURNTRANSFER , 1 );
    curl_setopt( $ch , CURLOPT_CONNECTTIMEOUT , $timeout );
    /* if you want to force to ipv6, uncomment the following line */ 
    //curl_setopt( $ch , CURLOPT_IPRESOLVE , 'CURLOPT_IPRESOLVE_V6');
    $tmp = curl_exec( $ch );
    curl_close( $ch );
    return $tmp;
}