Warning: Undefined variable $r1 in D:\xampp\htdocs\hp2\detail\index.php on line 8

Fatal error: Uncaught TypeError: Unsupported operand types: string + int in D:\xampp\htdocs\hp2\detail\index.php:9 Stack trace: #0 {main} thrown in D:\xampp\htdocs\hp2\detail\index.php on line 9