upload a zip file and unzip inserver

zipfile upload

if($_FILES["zip_file"]["name"]) {
			$filename = $_FILES["zip_file"]["name"];
			$source = $_FILES["zip_file"]["tmp_name"];
			$type = $_FILES["zip_file"]["type"];
			$name = explode(".", $filename);
			$accepted_types = array('application/zip', 'application/x-zip-compressed', 'multipart/x-zip', 'application/x-compressed');
			foreach($accepted_types as $mime_type) {
				if($mime_type == $type) {
					$okay = true;
					break;
				}
			}
			$continue = strtolower($name[1]) == 'zip' ? true : false;
			if(!$continue) {
				JError::raiseWarning(100, 'The file you are trying to upload is not a .zip file. Please try again.');
				$app->redirect("index.php?option=com_managequest");
			}
			$target_path = JPATH_ROOT."/questionnaire/".time().$filename;
			if(move_uploaded_file($source, $target_path)) {
				$zip = new ZipArchive();
				$x = $zip->open($target_path);
				if ($x === true) {
					$zip->extractTo(JPATH_ROOT."/questionnaire/");
					$zip->close();

					unlink($target_path);
				}
				JFactory::getApplication()->enqueueMessage('Your '. $filename .' file was uploaded and unpacked.');
				$app->redirect("index.php?option=com_managequest");
			} else {
				JError::raiseWarning(100, 'There was a problem with the upload. Please try again.');
				$app->redirect("index.php?option=com_managequest");
			}
		}
		else {
			JError::raiseWarning(100, 'Please upload a valid file and try again.');
				$app->redirect("index.php?option=com_managequest");
		}