softuniTunes

<?php
$lines = $_GET['text'];
$property = $_GET['property'];
$artistInput = $_GET['artist'];
$order = $_GET['order'];

preg_match_all('/^.*$/m', $lines, $matches);
$linesArr = array();

for ($i = 0; $i < count($matches[0]); $i++) {
    $songInfo = explode(" | ", $matches[0][$i]);
    $linesArr[] = [
        'name' => $songInfo[0],
        'genre' => $songInfo[1],
        'artist' => explode(", ", $songInfo[2]),
        'downloads' => (int)$songInfo[3],
        'rating' => floatval($songInfo[4])
    ];
}

//sort the names of the artists on each line

$sortedArtistNames = [];
foreach ($linesArr as $line) {
    asort($line['artist']);
    $line['artist'] = implode(", ", $line['artist']);
    $sortedArtistNames[] = $line;
}

//make a new array with only the lines that contain the name of the selected artist

$artistChosen = [];
foreach ($sortedArtistNames as $line) {
    foreach ($line as $key => $value) {
        if (strpos($value, $artistInput) !== false) {
            $artistChosen[] = $line;
        }
    }
}

//sort the lines by the given property

usort($artistChosen, function($s1, $s2) use ($order, $property) {
    if ($s1[$property] == $s2[$property]) {
        return strcmp($s1['name'], $s2['name']);
    }
    return ($order == "ascending" ^ $s1[$property] < $s2[$property]) ? 1 : -1;
});

//print the result

$output = "<table>\n<tr><th>Name</th><th>Genre</th><th>Artists</th><th>Downloads</th><th>Rating</th></tr>\n";

for ($i = 0; $i < count($artistChosen); $i++) {
    $name = htmlspecialchars($artistChosen[$i]['name']);
    $genre = htmlspecialchars($artistChosen[$i]['genre']);
    $artist = htmlspecialchars($artistChosen[$i]['artist']);
    $downloads = $artistChosen[$i]['downloads'];
    $rating = $artistChosen[$i]['rating'];
    $output .= "<tr><td>$name</td><td>$genre</td><td>$artist</td><td>$downloads</td><td>$rating</td></tr>\n";
}

$output .= "</table>";
echo $output;