A PHP Error was encountered

Severity: 8192

Message: trim(): Passing null to parameter #1 ($string) of type string is deprecated

Filename: controllers/Certificate_verify.php

Line Number: 20

Backtrace:

File: /home/trackman/domains/students.hypertechglobaltechnologies.com/public_html/application/controllers/Certificate_verify.php
Line: 20
Function: trim

File: /home/trackman/domains/students.hypertechglobaltechnologies.com/public_html/index.php
Line: 315
Function: require_once