problems in insert checkbox value and corresponding text value.

I try your solution , but the output should be
certid[1] = 300
certid[2] = 300
certid[3] =
0

Please read my answer again and you will see I changed the values in the noc1 fields for demonstration purposes.
It is expected that you will put the values back to what you need for your application.

It was not at all clear that you wanted unchecked rows set to zero. With the information I have given you that should not be too hard to figure out. There are a number of different ways to determine what inputs are missing from the $certid array.