Insert HTML form data to mySQL via PHP (form array vary from amount of table rows)

I think you want to store the answers to the 50 questions, right?

First of all, your table structure should look something like this:

questions
---------
id: primary key, int(11), auto increments
question/title: varchar(255)

answers
-------
id: primary key, int(11), auto increments
question_id: int(11)
answer: tinyint(1)

This is the tricky part. To display the questions (I used mysqli as I don't know what you're using):

$result = $mysqli->query("SELECT * from questions");

while ($question = $result->fetch_assoc()) {
    print 'Question: ' . $question['title'];
    print '<input type="hidden" name="answers[]['question_id']" value="' . $question['id'] . '">';
    print '<input type="radio" name="answers[]['answer']" value="1"> Yes'; 
    print '<input type="radio" name="answers[]['answer']" value="0"> No';
}

Now when a user submits his answers:

if(isset($_POST['submit'])) {
    $answers = $_POST['answers'];

    if(count($answers) > 1) {

        //Loop through all the answers
        foreach($answers as $answer) {
            $mysqli->query("INSERTO INTO answer ('question_id', 'answer') VALUES ('{$answer['question_id']}', '{$answer['answer']')"); //Insert the answers one by one
        }

    } else {
       print 'You need to submit at least one answer!'
    }

}

I haven't tested the code. This is still pretty basic, but it's exactly what you need, I think... :-).