'What is the impact of climate change on the planet?',
'options' => [
'Rising sea levels',
'More natural disasters',
'Increased temperatures globally',
'All of the above'
],
'answer' => 'All of the above'
],
[
'question' => 'Heat waves enter the atmosphere and are trapped because of the thick layer of gases that surround the planet. This is called…',
'options' => [
'Thick Atmosphere Effect',
'Greenhouse Effect',
'Increasing Heat Effect',
'None of the above'
],
'answer' => 'Greenhouse Effect'
],
[
'question' => 'When did climate change begin?',
'options' => [
'When the Industrial Revolution began',
'When the world population was larger than two billion people',
'It always has existed',
'Yesterday!'
],
'answer' => ['When the Industrial Revolution began', 'It always has existed']
]
];
$question_index = isset($_GET['q']) ? (int)$_GET['q'] : 0;
if ($question_index === 0) {
unset($_SESSION['quiz_completed_reward']);
}
$feedback = '';
if (isset($_POST['answer'])) {
$selected_answer = $_POST['answer'];
$correct_answer = $questions[$question_index]['answer'];
$is_correct = false;
if (is_array($correct_answer)) {
if (in_array($selected_answer, $correct_answer)) {
$is_correct = true;
}
} else {
if ($selected_answer == $correct_answer) {
$is_correct = true;
}
}
if ($is_correct) {
$feedback = '
