PHP Singleton for AWS SDK S3

Singleton

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

require_once 'vendor/autoload.php';
use Aws\S3\S3Client;

final class AWS_S3 
{

	private static $client = null;

	private function __construct() {
	}

	// call this method to get singleton
	public static function instance()
	{
		static $instance = null;
		if (self::$client === null) {

	        self::$client = S3Client::factory(array(
			    'key'    => 'PUT IN YOUR KEY',
			    'secret' => 'PUT IN YOUR SECRET KEY'
			));

			$instance = new AWS_S3();
      }
        return $instance;
	}

	public function get_client()
	{
		return self::$client;
	}
	
	//first should be $_FILES['file']['tmp_name'], second should be $_FILES['file']['name']
	public function save($file, $file_name)
	{
		$bucket = "Your bucket Name!";

		if (!$s3Client->doesBucketExist($bucket)) {
			$result = $s3Client->createBucket(array(
			    'Bucket' => $bucket
			));
			$s3Client->waitUntilBucketExists(array('Bucket' => $bucket));
		}

		$file_name = uniqid().'/'.$file_name;

		$result = $s3Client->putObject(array(
		    'Bucket' => $bucket,
		    'Key'    => $file_name,
		    'SourceFile'   => $file,
		    'ACL' => 'public-read'
		));

		return $result;
	}

}

/* End of file AWS_S3.php */
/* Location: ./application/models/AWS_S3.php */