A PHP Error was encountered

Severity: Notice

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

Filename: controllers/Home.php

Line Number: 220

Backtrace:

File: /home/rmcomput/public_html/application/controllers/Home.php
Line: 220
Function: _error_handler

File: /home/rmcomput/public_html/index.php
Line: 315
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home/rmcomput/public_html/system/core/Exceptions.php:271)

Filename: core/Common.php

Line Number: 570

Backtrace:

File: /home/rmcomput/public_html/application/models/Common_model.php
Line: 220
Function: get

File: /home/rmcomput/public_html/application/controllers/Home.php
Line: 221
Function: get_data_array

File: /home/rmcomput/public_html/index.php
Line: 315
Function: require_once

A Database Error Occurred

Error Number: 1300

Invalid utf8mb3 character string: '\xEF'

SELECT * FROM `rmcomputer_course` WHERE `parent_id` = `ï` ORDER BY `rmcomputer_course`.`id` DESC

Filename: models/Common_model.php

Line Number: 220