values from checkbox

Hello.

I want to post of textvalue+checkbox value into the form



<input type="checkbox"id="mycheck2" name="certid[]" value="2" class="cbx"  > 



<input type="number" id="primaryincome2"  min="0"  max="999" name="noc">



I want to get the values like 

1_1

2_1

3_1

4_2

the first value from checkbox and second value from textbox (no of copies)

https://4kpornindex.com/