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 - 市場失靈圖 - 前往 https://ocw.niu.edu.tw/pluginfile.php/508/mod_folder/content/0/Chapter 8 外部性與公共財-完整版.pdf?forcedownload=1
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並前往 https://ocw.niu.edu.tw/pluginfile.php/508/mod_folder/content/0/Chapter%208%20%E5%A4%96%E9%83%A8%E6%80%A7%E8%88%87%E5%85%AC%E5%85%B1%E8%B2%A1-%E5%AE%8C%E6%95%B4%E7%89%88.pdf?forcedownload=1

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