Warning: Trying to access array offset on value of type null in /home1/www/lecture_detail.php on line 34

Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /home1/www/mainfile.php on line 162

Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /home1/www/mainfile.php on line 162

Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /home1/www/mainfile.php on line 162

Fatal error: Uncaught TypeError: mktime(): Argument #4 ($month) must be of type ?int, string given in /home1/www/mainfile.php:162 Stack trace: #0 /home1/www/mainfile.php(162): mktime() #1 /home1/www/lecture_detail.php(34): date_to_epoch() #2 {main} thrown in /home1/www/mainfile.php on line 162