Aplikacja ankietowa (XML/JSON)

{
  "poll": {
    "id": 1,
    "question": "Jaki jest Twój ulubiony język programowania?",
    "created_at": "2026-02-13 10:00:00"
  },
  "options": [
    { "id": "a", "text": "PHP", "votes": 15 },
    { "id": "b", "text": "JavaScript", "votes": 23 },
    { "id": "c", "text": "Python", "votes": 18 },
    { "id": "d", "text": "Java", "votes": 8 }
  ],
  "total_votes": 64
}

<?xml version="1.0" encoding="UTF-8"?>
<poll id="1" created="2026-02-13">
  <question>Jaki jest Twój ulubiony język programowania?</question>
  <options>
    <option id="a" votes="15">PHP</option>
    <option id="b" votes="23">JavaScript</option>
    <option id="c" votes="18">Python</option>
    <option id="d" votes="8">Java</option>
  </options>
</poll>

<?php
function addVote(string $optionId): bool {
    $filePath = 'data/poll.json';
    $data = json_decode(file_get_contents($filePath), true);

    foreach ($data['options'] as &$option) {
        if ($option['id'] === $optionId) {
            $option['votes']++;
            $data['total_votes']++;

            return file_put_contents(
                $filePath,
                json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE),
                LOCK_EX
            ) !== false;
        }
    }

    return false;
}

// Użycie:
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['option'])) {
    $optionId = $_POST['option'];
    if (addVote($optionId)) {
        $_SESSION['voted'] = true;
        header('Location: results.php');
        exit;
    }
}

<?php
function calculatePercentages(array $options, int $total): array {
    if ($total === 0) {
        return array_map(fn($o) => ['option' => $o, 'percent' => 0], $options);
    }

    return array_map(function($option) use ($total) {
        return [
            'option' => $option,
            'percent' => round(($option['votes'] / $total) * 100, 1)
        ];
    }, $options);
}

// Użycie:
$data = json_decode(file_get_contents('data/poll.json'), true);
$results = calculatePercentages($data['options'], $data['total_votes']);

foreach ($results as $result) {
    echo $result['option']['text'] . ': ' . $result['percent'] . '%';
}

<?php
session_start();

function hasVoted(): bool {
    return isset($_SESSION['voted']) && $_SESSION['voted'] === true;
}

function markAsVoted(): void {
    $_SESSION['voted'] = true;
}

// W obsłudze głosowania:
if (hasVoted()) {
    $errors[] = 'Już oddałeś głos w tej ankiecie!';
} else {
    addVote($_POST['option']);
    markAsVoted();
}

document.getElementById('pollForm').addEventListener('submit', function(e) {
    const selected = document.querySelector('input[name="option"]:checked');

    if (!selected) {
        e.preventDefault();
        alert('Musisz wybrać jedną z odpowiedzi!');
        return false;
    }
});

.result-item {
    margin-bottom: 16px;
}

.result-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 4px;
    font-weight: 500;
}

.result-bar-container {
    background-color: #e5e7eb;
    border-radius: 4px;
    height: 24px;
    overflow: hidden;
}

.result-bar {
    background-color: #3b82f6;
    height: 100%;
    transition: width 0.5s ease;
    border-radius: 4px;
}

.result-bar.winner {
    background-color: #10b981;
}

.result-votes {
    font-size: 0.85em;
    color: #6b7280;
    margin-top: 4px;
}

<?php
function loadPollFromXml(string $filePath): array {
    $xml = simplexml_load_file($filePath);

    $poll = [
        'id' => (int) $xml['id'],
        'question' => (string) $xml->question,
        'options' => []
    ];

    foreach ($xml->options->option as $option) {
        $poll['options'][] = [
            'id' => (string) $option['id'],
            'text' => (string) $option,
            'votes' => (int) $option['votes']
        ];
    }

    return $poll;
}

function savePollToXml(array $poll, string $filePath): bool {
    $xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><poll/>');
    $xml->addAttribute('id', $poll['id']);

    $xml->addChild('question', $poll['question']);
    $options = $xml->addChild('options');

    foreach ($poll['options'] as $opt) {
        $option = $options->addChild('option', $opt['text']);
        $option->addAttribute('id', $opt['id']);
        $option->addAttribute('votes', $opt['votes']);
    }

    return $xml->asXML($filePath) !== false;
}