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 - 正向力定義 - 前往 https://www.student.tw/topic/104944-【問題】摩擦力阻止運動？、正向力不一定存在？/
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您即將離開本站

並前往 https://www.student.tw/topic/104944-%E3%80%90%E5%95%8F%E9%A1%8C%E3%80%91%E6%91%A9%E6%93%A6%E5%8A%9B%E9%98%BB%E6%AD%A2%E9%81%8B%E5%8B%95%EF%BC%9F%E3%80%81%E6%AD%A3%E5%90%91%E5%8A%9B%E4%B8%8D%E4%B8%80%E5%AE%9A%E5%AD%98%E5%9C%A8%EF%BC%9F/

是否確定要離開？