Google drive php upload for large files

<?php

class gdrive{

	//credentials (get those from google developer console https://console.developers.google.com/)

var $clientId = "104799672448p42m.apps.googleusercontent.com";

var $clientSecret = "7DWVXT";
var $redirectUri = 'http://localhost/google_drive2/gdrive_upload.php';

	//variables
	var $fileRequest;
	var $mimeType;
	var $filename;
	var $path;
	var $client;


	function __construct(){
error_reporting(E_ALL); ini_set('display_errors', 1);
		require_once 'src/Google/autoload.php'; // get from here https://github.com/google/google-api-php-client.git
		require_once 'src/Google/Client.php'; // get from here https://github.com/google/google-api-php-client.git
		require_once 'src/Google/Service.php'; // get from here https://github.com/google/google-api-php-client.git
		require_once 'src/Google/Service/Drive.php'; // get from here https://github.com/google/google-api-php-client.git

		$this->client = new Google_Client();
	}


	function initialize(){
		//echo "<br/>initializing class\n";
		$client = $this->client;

		$client->setClientId($this->clientId);
		$client->setClientSecret($this->clientSecret);
		$client->setRedirectUri($this->redirectUri);
		$client->addScope('https://www.googleapis.com/auth/drive',
            'https://www.googleapis.com/auth/drive.appfolder',
            'https://www.googleapis.com/auth/drive.file');


		$refreshToken = file_get_contents(__DIR__ . "/token.txt");

		$client->refreshToken($refreshToken);
		$tokens = $client->getAccessToken();

		$client->setAccessToken($tokens);
		//$client->setDefer(true);
		$this->processFile();

	}

	function processFile(){

		$fileRequest = $this->fileRequest;
		//echo "Process File $fileRequest\n";
		$path_parts = pathinfo($fileRequest);
		$this->path = $path_parts['dirname'];
		$finfo = finfo_open(FILEINFO_MIME_TYPE);
		$this->mimeType = finfo_file($finfo, $fileRequest);
		finfo_close($finfo);

		//echo "Mime type is " . $this->mimeType . "\n";

		$this->upload();

	}


/**
* Get the folder ID if it exists, if it doesnt exist, create it and return the ID
*
* @param Google_DriveService $service Drive API service instance.
* @param String $folderName Name of the folder you want to search or create
* @param String $folderDesc Description metadata for Drive about the folder (optional)
* @return Google_Drivefile that was created or got. Returns NULL if an API error occured
*/
function getFolderExistsCreate($service, $folderName, $folderDesc) {



	$parameters['q'] = "mimeType='application/vnd.google-apps.folder' and trashed=false";
	$files = $service->files->listFiles($parameters);
	$found = false;
	// Go through each one to see if there is already a folder with the specified name

	$found = false;
	// Go through each one to see if there is already a folder with the specified name
	foreach ($files['items'] as $item) {
		if ($item['title'] == $folderName) {
			$found = true;
			return $item['id'];
			break;
		}
	}
	// If not, create one
	if ($found == false) {
		$folder = new Google_Service_Drive_DriveFile();
		//Setup the folder to create
		$folder->setTitle($folderName);
		if(!empty($folderDesc))
			$folder->setDescription($folderDesc);
		$folder->setMimeType('application/vnd.google-apps.folder');
		//Create the Folder
		try {
			$createdFile = $service->files->insert($folder, array(
				'mimeType' => 'application/vnd.google-apps.folder',
				));
			// Return the created folder's id
			return $createdFile->id;
		} catch (Exception $e) {
			//print "An error occurred: " . $e->getMessage();
			print_r($e);
		}
	}
}

	function upload(){
		$client = $this->client;
		$service = new Google_Service_Drive($client);




		$folderName=rand();
	 	$folderDesc='Folder Desc';
		//$client->setDefer(false);
	// Setup the folder you want the file in, if it is wanted in a folder
	if(isset($folderName)) {
		if(!empty($folderName)) {
			$parent = new Google_Service_Drive_ParentReference();
			$parent->setId($this->getFolderExistsCreate($service, $folderName, $folderDesc));
			$file = new Google_Service_Drive_DriveFile();
			$file->title = "a.csv";
			$chunkSizeBytes = 1 * 1024 * 1024;
			$file->setParents(array($parent));
		}
	}

//$client->setDefer(true);




		$fileRequest = $this->fileRequest;
		$mimeType = $this->mimeType;
		$request = $service->files->insert($file,array('mimeType'=> 'binary/octet-stream'));

		// Create a media file upload to represent our upload process.
		$media = new Google_Http_MediaFileUpload(
		  $client,
		  $request,
		  $mimeType,
		  null,
		  true,
		  $chunkSizeBytes
		);
		$media->setFileSize(filesize($fileRequest));


//$request = $this->google_drive->files->insert($file, array('mimeType'=> 'binary/octet-stream', 'mediaUpload' => $media));


		// Upload the various chunks. $status will be false until the process is
		// complete.
		$status = false;
		$handle = fopen($fileRequest, "rb");

		// start uploading
		//echo "Uploading: " . $this->filename . "\n";

		$filesize = filesize($fileRequest);

		// while not reached the end of file marker keep looping and uploading chunks
		while (!$status && !feof($handle)) {
			$chunk = fread($handle, $chunkSizeBytes);
			$status = $media->nextChunk($chunk);
		}

		// The final value of $status will be the data from the API for the object
		// that has been uploaded.
		$result = false;
		if($status != false) {
		  $result = $status;
		}

		fclose($handle);
		// Reset to the client to execute requests immediately in the future.
		$client->setDefer(false);
		?>https://drive.google.com/open?id=<?= $result->id ?><?php
	}

}

?>