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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

台鐵車站情報站 - 微積分臨界點定義 - 前往 https://ocw.nthu.edu.tw/ocw/upload/7/news/L17_critical point(臨界點) First derivative test(一階導函數測試) Second derivative test(二階導函數測試) 4.6 Concavity and points of inflection(圖形凹性和反曲點) Concave up and concave down.pdf
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台灣鐵路發展超過百年，有完整的環島路線，每個車站都成為當地發展的重要指標，火車站周圍有什麼特別的，看看網紅們怎麼說

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