good day everyone, Am trying to update my poduct table such that each time
item quantity is added to item total the value keeps up increasing
eg 1+1 =2, 2+3 =5 and so on, but if I try to update the table column(item_total),
the new update always replace the old value instead of increasing it and the error below will
"Notice: Undefined index: Radio in C:\test\htdocs\product.php on line 32"