How to download youtube video using php API?

I have a lot of research on YouTube video download now we will show you how to download the video using Youtube using PHP API.

YouTube video downloader script below to use for download the YouTube video for offline uses. 

Check the below function of PHP API to use in downloadable 

(ytbDownloader.class.php

• setUrl() – Set the video file URL.
• getVideoInfo() – Get the video information.
• extractVideoId() – Get video Id from YouTube video URL.
• getDownloader() – Get the downloader object if the pattern matches otherwise return false.
• getVideoDownloadLink() – Get the video download URL with video info (tag, quality, title, mime, and format).
• getStreamArray() – Get the youtube root data that contains the video information.
• hasVideo() – Validate the YouTube video URL.

<?php/**
 * phptechnicalgroups
 *
 * This is the Downloader class helps to download youtube video.
 *
 * @class       YouTubeDownloader
 * @author      phptechnicalgroups
 * @link        https://phptechnicalgroups.blogspot.com
 *
 */class YouTubeDownloader {
    /*
     * Video Id for the given url
     */
    private $video_id;
     
    /*
     * Video title for the given video
     */
    private $video_title;
     
    /*
     * Full URL of the video
     */
    private $video_url;
    
    /*
     * store the url pattern and corresponding downloader object
     * @var array
     */
    private $link_pattern;
    
    public function __construct(){
        $this->link_pattern = "/^(?:http(?:s)?:\/\/)?(?:www\.)?(?:m\.)?(?:youtu\.be\/|youtube\.com\/(?:(?:watch)?\?(?:.*&)?v(?:i)?=|(?:embed)\/))([^\?&\"'>]+)/";
    }
    
    /*
     * Set the url
     * @param string
     */
    public function setUrl($url){
        $this->video_url = $url;
    }
    
    /*
     * Get the video information
     * return string
     */
    private function getVideoInfo(){
        return file_get_contents("https://www.youtube.com/get_video_info?video_id=".$this->extractVideoId($this->video_url)."&cpn=CouQulsSRICzWn5E&eurl&el=adunit");
    }
     
    /*
     * Get video Id
     * @param string
     * return string
     */
    private function extractVideoId($video_url){
        //parse the url
        $parsed_url = parse_url($video_url);
        if($parsed_url["path"] == "youtube.com/watch"){
            $this->video_url = "https://www.".$video_url;
        }elseif($parsed_url["path"] == "www.youtube.com/watch"){
            $this->video_url = "https://".$video_url;
        }
        
        if(isset($parsed_url["query"])){
            $query_string = $parsed_url["query"];
            //parse the string separated by '&' to array
            parse_str($query_string, $query_arr);
            if(isset($query_arr["v"])){
                return $query_arr["v"];
            }
        }   
    }
    
    /*
     * Get the downloader object if pattern matches else return false
     * @param string
     * return object or bool
     * 
     */
    public function getDownloader($url){
        /*
         * check the pattern match with the given video url
         */
        if(preg_match($this->link_pattern, $url)){
            return $this;
        }
        return false;
    }
     
    /*
     * Get the video download link
     * return array
     */
    public function getVideoDownloadLink(){
        //parse the string separated by '&' to array
        parse_str($this->getVideoInfo(), $data);
         
        //set video title
        $this->video_title = $data["title"];
         
        //Get the youtube root link that contains video information
        $stream_map_arr = $this->getStreamArray();
        $final_stream_map_arr = array();
         
        //Create array containing the detail of video 
        foreach($stream_map_arr as $stream){
            parse_str($stream, $stream_data);
            $stream_data["title"] = $this->video_title;
            $stream_data["mime"] = $stream_data["type"];
            $mime_type = explode(";", $stream_data["mime"]);
            $stream_data["mime"] = $mime_type[0];
            $start = stripos($mime_type[0], "/");
            $format = ltrim(substr($mime_type[0], $start), "/");
            $stream_data["format"] = $format;
            unset($stream_data["type"]);
            $final_stream_map_arr [] = $stream_data;         
        }
        return $final_stream_map_arr;
    }
     
    /*
     * Get the youtube root data that contains the video information
     * return array
     */
    private function getStreamArray(){
        parse_str($this->getVideoInfo(), $data);
        $stream_link = $data["url_encoded_fmt_stream_map"];
        return explode(",", $stream_link); 
    }
     
    /*
     * Validate the given video url
     * return bool
     */
    public function hasVideo(){
        $valid = true;
        parse_str($this->getVideoInfo(), $data);
        if($data["status"] == "fail"){
            $valid = false;
        } 
        return $valid;
    }
     
}

Download Youtube Video using PHP API

Use the helper functions of ytbDownloader class to get the download link of the YouTube video. The following process is followed to download the YouTube video file using PHP.

• Load and initialize the downloader class.
• Get the downloader object.
• Set the YouTube URL.
• Validate the YouTube video URL.
• Get the video download link and video info.
• Force download video file from YouTube.

<?php// Load and initialize downloader classinclude_once 'YouTubeDownloader.class.php';$handler = new YouTubeDownloader();
// Youtube video url$youtubeURL = 'https://www.youtube.com/watch?v=f7wcKoEbUSA';
// Check whether the url is validif(!empty($youtubeURL) && !filter_var($youtubeURL, FILTER_VALIDATE_URL) === false){
    // Get the downloader object
    $downloader = $handler->getDownloader($youtubeURL);
    
    // Set the url
    $downloader->setUrl($youtubeURL);
    
    // Validate the youtube video url
    if($downloader->hasVideo()){
        // Get the video download link info
        $videoDownloadLink = $downloader->getVideoDownloadLink();
        
        $videoTitle = $videoDownloadLink[0]['title'];
        $videoQuality = $videoDownloadLink[0]['quality'];
        $videoFormat = $videoDownloadLink[0]['format'];
        $videoFileName = strtolower(str_replace(' ', '_', $videoTitle)).'.'.$videoFormat;
        $downloadURL = $videoDownloadLink[0]['url'];
        
        // 
        $fileName = preg_replace('/[^A-Za-z0-9.\_\-]/', '', basename($videoFileName));
        if(!empty($downloadURL)){
            // Define headers
            header("Cache-Control: public");
            header("Content-Description: File Transfer");
            header("Content-Disposition: attachment; filename=$fileName");
            header("Content-Type: application/zip");
            header("Content-Transfer-Encoding: binary");
            
            // Read the file
            readfile($downloadURL);
        }
    }else{
        echo "The video is not available, please correct your YouTube URL.";
    }
}else{
    echo "Please correct valid YouTube URL.";
}?>