<?php

// task 1

$data[] = array(
    'task'   => "Lorem Ipsum",
    'clue'   => "Find them in Fiona's blog",
    'answer' => "Lorem Ipsum"
);

// task 2

$data[] = array(
    'task'   => "Lorem Ipsum",
    'clue'   => "Find them in Fiona's blog",
    'answer' => "Lorem Ipsum"
);

// initialize flags

$i = 0;
$isCorrect = false;
$answered = false;

// process submitted <form>

if (isset($_POST) AND $_POST)
{
    foreach ($_POST as $key => $answer)
    {
        if (preg_match('/task([0-9]+)/i', $key, $matches))
        {
            $i = $matches[1];

            // check answer

            if ($data[$i]['answer'] == strtolower(trim($answer)))
            {
                $i += 1;
                $isCorrect = true;

            }

            $answered = true;
        }
    }
}

echo $isCorrect ? '{"result": true}' : '';