PHP posting form with array indices

Question

I am generating a survey questions page, with questions from database. HTML input type changes in accordance with question type:

form.php

<?php
$query = "select q_id,qtext from questions order by q_id ";
$result = mysqli_query($conn, $query); // replaced with procedural mysqli
if (mysqli_num_rows($result) == 0)
    $flag = 1;
else {
    if (!$result)
        $result_list = array();
    while ($row = mysqli_fetch_array($result)) {
        $result_list[] = $row;
    }
    $i = 0;
    foreach ($result_list as $row) {
        $q_id[$i] = $row[0];
        $qtext[$i] = $row[1];
        $i++;
    }
}
?>
<form action="action.php" method="post" name="form">
    <?php
    for ($j = 0; $j < $i; $j++) {
        unset($res_list);
        switch ($qtype[$j]) {

            case text:
                echo " <textarea name='qno[$j]'></textarea><br/>";
                break;

            case checkbox:

                for ($l = 0; $l < 3; $l++)
                    echo "<input type='checkbox'  name='qno[$j]' > <label>  $l </label>";
                break;
        }
    }
    ?>

</form>

This page is working fine. But I can't get this data via $_POST. Here is

action.php

<?php

for ($j = 0; $j <= $no_of_ques; $j++) {
    $answer[$j] = $_POST['qno'][$j];
    echo $answer[$j];
}
?>

What name should i give to my inputs and how should I get them via POST?

Answer 1

Through referring your code snippet as a solution, Please examine the output of var_dump($_POST), within its output observe that key qno exists with its corresponding values.

Please try executing following code snippet to fetch all data of qno key

for($i =0 ; $i < count($_POST['qno']) ;$i++) {
    echo $_POST['qno'][$i];
}

Answer 2

At first glance, there's nothing wrong with your code (since your most recent edits) so you should try print_r($_POST) to debug and see what your post data actually contains.

Then you can iterate over the answers more easily with a foreach loop like this in action.php

foreach ($_POST['qno'] as $i => $answer) {
    echo "Answer Number $i: $answer";
}