A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: helpers/my_helper.php

Line Number: 24

Backtrace:

File: /var/www/html/application/helpers/my_helper.php
Line: 24
Function: _error_handler

File: /var/www/html/application/controllers/Langswitch.php
Line: 35
Function: back

File: /var/www/html/index.php
Line: 305
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /var/www/html/system/core/Exceptions.php:271)

Filename: helpers/url_helper.php

Line Number: 582

Backtrace:

File: /var/www/html/application/helpers/my_helper.php
Line: 24
Function: redirect

File: /var/www/html/application/controllers/Langswitch.php
Line: 35
Function: back

File: /var/www/html/index.php
Line: 305
Function: require_once