Selection in Radio Button gets replaced in two divs - php

Question

I have two questions with radio button (each question having 4 radio) in PHP
But there is single check in all 8 radio buttons, but it should be, with 4-4 radio buttons.
Look: https://imgur.com/Sytl72a
My Code:
<form method="post" enctype="multipart/form-data" class="form-horizontal">
<?php
$lstmt = $user->runQuery("SELECT * FROM mcq WHERE LRN=:lrn ORDER BY Sr ASC ");
$lstmt->bindparam(":lrn",$id);
$lstmt->execute();
if($lstmt->rowCount() > 0)
{
$i=0;
while($lrow=$lstmt->fetch(PDO::FETCH_ASSOC))
{
extract($lrow);
$i++;
?>
<div>
<h1><?php echo $i; ?>) <?php echo $Question; ?></h1></br>
<h2> <input type="radio" name="radio" value="<?php echo $Oa; ?>"> A) <?php echo $Oa; ?></h2>
<h2> <input type="radio" name="radio" value="<?php echo $Ob; ?>"> B) <?php echo $Ob; ?></h2>
<h2> <input type="radio" name="radio" value="<?php echo $Oc; ?>"> C) <?php echo $Oc; ?></h2>
<h2> <input type="radio" name="radio" value="<?php echo $Od; ?>"> D) <?php echo $Od; ?></h2>
</div>
<hr></br></br>
<?php
}
}
?>
<button class="btn btn-large btn-primary" type="submit" name="btn-submit">Submit</button>
</form>
<?php
}
if(isset($_POST['btn-submit']))
{
echo $ufname = trim($_POST['radio']);
}
?>

Answer 1

Update your radio input name attribute just like this,
<div>
<h1><?php echo $i; ?>) <?php echo $Question; ?></h1></br>
<h2> <input type="radio" name="radio<?php echo $i; ?>?>" value="<?php echo $Oa; ?>"> A) <?php echo $Oa; ?></h2>
<h2> <input type="radio" name="radio<?php echo $i; ?>" value="<?php echo $Ob; ?>"> B) <?php echo $Ob; ?></h2>
<h2> <input type="radio" name="radio<?php echo $i; ?>" value="<?php echo $Oc; ?>"> C) <?php echo $Oc; ?></h2>
<h2> <input type="radio" name="radio<?php echo $i; ?>" value="<?php echo $Od; ?>"> D) <?php echo $Od; ?></h2>
</div>
And for submitting:
<?php
}
$count = $i;
for($j = 1; $j <= $count; $j++){ if(isset($_POST['btn-submit'])) {
echo $ufname = trim($_POST['radio'.$j]);
}
}
?>
It will definitely solve your problem,