softuniTunes

<?php
$artist = $_GET['artist'];
$sortProperty = $_GET['property'];
$order = $_GET['order'];
$inputSongs = explode("\n", $_GET['text']);

$songsList = array();
foreach ($inputSongs as $inputRow) {
    $inputRow = preg_split('/\s*\|\s*/', $inputRow, -1, PREG_SPLIT_NO_EMPTY);
    $artists = preg_split('/,\s*/', $inputRow[2], -1, PREG_SPLIT_NO_EMPTY);
    if (!in_array($artist, $artists)) {
        continue;
    }

    sort($artists);
    $song = new stdClass();
    $song->name = $inputRow[0];
    $song->genre = $inputRow[1];
    $song->artists = implode(', ', $artists);
    $song->downloads = (int)$inputRow[3];
    $song->rating = (float)$inputRow[4];

    $songsList[] = $song;
}

usort($songsList, function ($a, $b) use ($sortProperty, $order) {
    if ($a->$sortProperty == $b->$sortProperty) {
        return strcmp($a->name, $b->name);
    } elseif ($order == 'ascending') {
        return ($a->$sortProperty > $b->$sortProperty) ? 1 : -1;
    } else {
        return ($a->$sortProperty < $b->$sortProperty) ? 1 : -1;
    }
});

echo "<table>\n<tr><th>Name</th><th>Genre</th><th>Artists</th><th>Downloads</th><th>Rating</th></tr>\n";
foreach ($songsList as $song) {
    $name = htmlspecialchars($song->name);
    $genre = htmlspecialchars($song->genre);
    $artists = htmlspecialchars($song->artists);
    $downloads = htmlspecialchars($song->downloads);
    $rating = htmlspecialchars($song->rating);
    echo "<tr><td>{$name}</td><td>{$genre}</td><td>{$artists}</td><td>{$downloads}</td><td>{$rating}</td></tr>\n";
}
echo '</table>';