A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type null

Filename: models/Site_model.php

Line Number: 233

Backtrace:

File: /var/www/html/KOL/voice/application/models/Site_model.php
Line: 233
Function: _error_handler

File: /var/www/html/KOL/voice/application/controllers/Exitpage.php
Line: 109
Function: get_keyword_cat

File: /var/www/html/KOL/voice/public/index.php
Line: 319
Function: require_once

A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type null

Filename: models/Site_model.php

Line Number: 233

Backtrace:

File: /var/www/html/KOL/voice/application/models/Site_model.php
Line: 233
Function: _error_handler

File: /var/www/html/KOL/voice/application/controllers/Exitpage.php
Line: 110
Function: get_keyword_cat

File: /var/www/html/KOL/voice/public/index.php
Line: 319
Function: require_once

疑難雜症萬事通 - 樣本數30 - 前往 https://chuckncyu.wordpress.com/2017/03/20/量化分析，為何樣本數要大於等於30？/
疑難雜症萬事通
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您即將離開本站

並前往 https://chuckncyu.wordpress.com/2017/03/20/%E9%87%8F%E5%8C%96%E5%88%86%E6%9E%90%EF%BC%8C%E7%82%BA%E4%BD%95%E6%A8%A3%E6%9C%AC%E6%95%B8%E8%A6%81%E5%A4%A7%E6%96%BC%E7%AD%89%E6%96%BC30%EF%BC%9F/

是否確定要離開？