Warning: Undefined array key "week" in C:\xampp\htdocs\cieclock\rollDB.php on line 5

Warning: Undefined array key "stid" in C:\xampp\htdocs\cieclock\rollDB.php on line 6

Fatal error: Uncaught mysqli_sql_exception: Unknown column 'w' in 'where clause' in C:\xampp\htdocs\cieclock\rollDB.php:31 Stack trace: #0 C:\xampp\htdocs\cieclock\rollDB.php(31): mysqli_query(Object(mysqli), 'select stid fro...') #1 {main} thrown in C:\xampp\htdocs\cieclock\rollDB.php on line 31