Merge pull request #45 from nguyenanhung/v3.2.0-develop

Upgrade CodeIgniter Framework next-gen version v3.2.0-develop

Author: nguyenanhung

system/helpers/string_helper.php

@@ -257,6 +257,9 @@ function random_string($type = 'alnum', $length = 16)
 			case 'unique':
 				return md5(uniqid(mt_rand(), true));
 				break;
+			case 'base64':
+				return base64_encode(md5(uniqid(mt_rand(), true)));
+				break;
 			case 'sha1' :
 				return sha1(uniqid(mt_rand(), true));
 				break;