How to get the selected radio button value in Payment processing - php

Question

I am trying to give payment processing option e wallet and cod in checkout page, with the help of radio button, but the selected value is not getting fetched in php. How can this be solved?
I could't upload my code, so I am explaining the required logic, please do help.
In payment process i need a radio button
Selected radio button value should be given to php, so that my further calculations will continue.
I am unable to get the value in to php.
CODE:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
$(function () {
$("input[name='cod']").click(function () {
if ($("#chkYes").is(":checked")) {
$("#dvPassport").show();
} else {
$("#dvPassport").hide();
}
});
});
</script>
<form method ="post">
<label for="chkYes">
<input type="radio" id="chkYes" name="cod" />
COD
</label>
<br/>
<label for="chkNo">
<input type="radio" id="chkNo" name="cod" />
E-Wallet
</label>
<hr />
<button type="submit" name="submit1" value="submit">Submit</button>
</form>
<div id="dvPassport" style="display: none">
<input type="text" id="txtPassportNumber" />
</div>
<?php
echo $com;
echo $grand_total;
if(isset($_POST['submit'])) {
if($grand_total <= $com) {
$com = $com - $grand_total;
$sql1 = mysqli_query($conn,"UPDATE commission SET total_commission=$com WHERE e_id = '".$_SESSION["e_id"]."'");
echo $com;
$total_pay = $com;
echo $total_pay;
} else {
$newcom = $grand_total - $com;
$sql2 = mysqli_query($conn,"UPDATE commission SET total_commission=$newcom WHERE e_id = '".$_SESSION["e_id"]."'");
$total_pay = $newcom;
echo $total_pay;
}
}
?>

Answer 1

It seems you haven't actually sent any variables to your php.
You can send the value of 'cod' by declaring a php var and assigning it the value via post, likewise for your txtPassportNumber, e.g.
$cod = $_POST['cod'];
$passNo = $_POST['txtPassportNumber'];
Include these php variables in your php file and then use them to continue with your calculations.
Hope this helps