Fatal error: Uncaught TypeError: Unsupported operand types: string - int in /home/schoolmanage/public_html/_schoolmanage.net/lib/function-lib.php:396 Stack trace: #0 /home/schoolmanage/public_html/_schoolmanage.net/r/index.php(7): extractIdFromBiggerNumber() #1 {main} thrown in /home/schoolmanage/public_html/_schoolmanage.net/lib/function-lib.php on line 396