How do I set values for radio buttons in PHP? - php

Question

How do I set names for each radio button in the following PHP code using counter variable, or any other alternative?
<?php
$id=0; //counter variable
$sql ="select roll_number,student_name,gender from student_table";
$query=mysqli_query($dbcon, $sql) or die(mysqli_error($dbcon));
while($post=mysqli_fetch_assoc($query)){
echo '<tr>';
echo '<td>'. $post['roll_number'] . '</td>';
echo '<td>'. $post['student_name'] . '</td>';
echo '<td>'. $post['gender'] . '</td>';
echo '<td width=250>';
echo '<input type="radio" name="rad'.$id'" value="P" />Present';
echo '<input type="radio" name="rad'.$id'" value="A" />Absent';
echo '<button type="submit" name="save" value="Save" class="btn btn-success btn-sm">Save</button>';
++$id;
echo '</td>';
echo '</tr>';
}
?>

Answer 1

echo '<input type="radio" name="rad[' . $post['roll_number'] . ']" value="P" />Present';
echo '<input type="radio" name="rad[' . $post['roll_number'] . ']" value="A" />Absent';
On the receiving end you may do like this:
$answers = $_POST['rad'];
foreach($answers as $roll_number=>$answer){
//do something with the $roll_number and $answer...
}

Answer 2

Updated the code, changed the $post to $row, concatenated the strings, fixed the <button> and so on. There is no form-declaration anywhere - if you have only one form, this will save / fetch every item in the form - depending on your needs, you might wanna declare a form per student, with a unique identifier.
<?php
$query = mysqli_query($dbcon, 'SELECT roll_number,student_name,gender FROM student_table') or die(mysqli_error($dbcon));
while ($row = mysqli_fetch_assoc($query)) {
echo '<tr>
<td>'.$row['roll_number'].'</td>
<td>'.$row['student_name'].'</td>
<td>'.$row['gender'].'</td>
<td width="250">
<label><input type="radio" name="rad['.$row['roll_number'].']" value="P">Present</label>
<label><input type="radio" name="rad['.$row['roll_number'].']" value="A">Absent</label>
<input type="submit" name="save" value="Save" class="btn btn-success btn-sm">
</td>
</tr>';
}
?>