Undefined index error PHP

Question

I\'m new in PHP and I\'m getting this error:

Notice: Undefined index: productid in /var/www/test/modifyform.php on line 32

Notice: Undef

Answer 1

To remove this error, in your html form you should do the following in enctype:

The following down is the cause of that error i.e if you start with form-data in enctype, so you should start with multipart: