A PHP Error was encountered

Severity: Warning

Message: Undefined array key "HTTP_REFERER"

Filename: controllers/Blog.php

Line Number: 107

Backtrace:

File: /www/wwwroot/aclas-college/application/controllers/Blog.php
Line: 107
Function: _error_handler

File: /www/wwwroot/aclas-college/index.php
Line: 289
Function: require_once

A PHP Error was encountered

Severity: 8192

Message: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated

Filename: helpers/url_helper.php

Line Number: 534

Backtrace:

File: /www/wwwroot/aclas-college/application/controllers/Blog.php
Line: 107
Function: redirect

File: /www/wwwroot/aclas-college/index.php
Line: 289
Function: require_once