04.ComputerShop

<?php
$list = explode("\n", $_GET['list']);
$minPrice = $_GET['minPrice'];
$maxPrice = $_GET['maxPrice'];
$filter = $_GET['filter'];
$order = $_GET['order'];

$id = 1;
$productsInfo = [];
$products = [];
foreach ($list as $line) {
    if (strlen($line) < 2) {
        continue;
    } else {
        $productsInfo = explode("|", trim($line));
        if ($filter == "all" || $filter == trim($productsInfo[1])) {
            if (floatval(trim($productsInfo[3])) >= floatval($minPrice) && floatval(trim($productsInfo[3])) <= floatval($maxPrice)) {
                $products[] = [
                    'id' => $id,
                    'name' => trim($productsInfo[0]),
                    'type' => trim($productsInfo[1]),
                    'components' => explode(', ', trim($productsInfo[2])),
                    'price' => floatval(trim($productsInfo[3]))
                ];
            }
        }
        $id++;
    }
}

usort($products, function($a, $b) use ($order) {
    if ($a['price'] == $b['price']) {
    return $a['id'] < $b['id'] ? -1 : 1;
}
    return ($order == "ascending" ^ $a['price'] < $b['price']) ? 1 : -1;
});

$output = "";
for ($i = 0; $i < count($products); $i++) {
    $price = htmlspecialchars($products[$i]['price']);
    $priceFormatted = number_format(round($price, 2), 2 , '.' , '');
    $output .= "<div class=\"product\" id=\"product" . $products[$i]['id'] . "\">";
    $output .= "<h2>" . htmlspecialchars($products[$i]['name']) ."</h2>";
    $output .= "<ul>";
    for ($j = 0; $j < count($products[$i]['components']); $j++) {
        $output .= "<li class=\"component\">" . htmlspecialchars($products[$i]['components'][$j]) . "</li>";
    }
    $output .= "</ul>";
    $output .= "<span class=\"price\">" . $priceFormatted ."</span>";
    $output .= "</div>";
}

echo $output;