Validation of radio button on PHP

Question

i'm trying to validate a radio button so it checks if a radio button has been selected or not

Answer 1

for radio button input form, you just get the value by the name of that radio button to check if it checked/selected. Only the checked radio button that will be submited.
eg. if you have

<input type="radio" id="a3" name="a" value="3">
<input type="radio" id="a4" name="a" value="4">

and the radio button with value="4" you checked, then you submitted, in php (if you using HTTP POST method) you 'll got $_POST['a'] with value "4"

cmiiw

Answer 2

@cahya thanks mate
worked fine🖒