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Notice: Undefined variable: kgroup_session in E:\xampp\htdocs\teacher2\m\inc\kgroupx.php on line 9

Notice: Undefined variable: kgroup_session in E:\xampp\htdocs\teacher2\m\inc\kgroupx.php on line 16

Fatal error: Uncaught Error: Call to undefined function mysql_query() in E:\xampp\htdocs\teacher2\m\inc\kgroupx.php:25 Stack trace: #0 {main} thrown in E:\xampp\htdocs\teacher2\m\inc\kgroupx.php on line 25